When someone says "iI don't know how to feel"

if it is infinitive then it is "to say" but here it would be "someone says"

When someone says "i don't know how to feel" what should we do or how todo we respond?

This question is a little bit general thattoo vague and needs to be clarified.

this sentence sounds a little unnatural the way you've written it, although it does make sense.

I can only can answer your question based on my imagination because your response is multiple which depends on the situation.

i don't know what you mean by "your response is multiple"

1. You are in a bad feelingmood and want to ask your friend to comfort you but your friend said “I don’t know to feel.” and nothing.

you could also so "you are feeling bad"

2. You are in a good feelingmood and share something with your friend and he is like this.

you could also say "you are feeling good" or "you are feeling happy"

You just tell yourself that don’tnot to do this again.

it sounds unnatural to say "that don't do this"

When someone says "iI don't know how to feel"

"I" is always capitalized anywhere in a sentence unlike other pronouns.

When someone say "iI don't know how to feel" what should we do or how toshould I respond?

This question is a little bit generalvague that needs to be clarified.

I am assuming you're saying its unclear on how to respond

I only can answer your question based on my imagination because your response is multiple which depends on the situation.

I would like to imagine three situations you may meet”encounter.

1. You are in a bad feeling andfeeling bad and you want to ask your friend to comfort you but your friend saidonly says “I don’t know to feel.” and nothing.

You can kick him out of your life and tell him:” you hurt me, bro.”

2. You are in a good feelingfeeling good (or in a good mood) and share something good news with your friend and he is like this.

ItThis means your friend just cannot getcan't understand why your're happy point.

Don’t blame him and explain why are you so happy which can have(create/make) a deep connection(bond) between you and him.

3. You are in a good or bad feelingmood and you get a response like you saidthis from a stranger.

You just tell yourself that don’t do this again.

You don’t need to share something with strangers and want to make them understand.

That’s hard and hurtlesful sometimes. Or That's hard and hurts sometimes.

The above are my hypotheticals and suggestions to them. Or The above are my imaginated scenarions and suggestions.

When someone says "iI don't know how to feel"

We always capatalise I

When someone says "iI don't know how to feel", what should we do or how toshould we respond?

This question is a little bit general thatand needs to be clarified.

I can only can answer your question based on my imaginationunderstanding because your response is multiplequestions has multiple responses which depends on the situation.

We would use understanding not imagination. Imagination we normally use for creative things, so understanding makes more sense to use here.

I would like to imaginediscuss three situations you may meet”encounter:

Use discuss because it lets the reader know you are about to write about the situations. Encounter means the same thing as meet, however, it fits the tone of what you have written better

1. You are in a bad feelingmood and want to ask your friend to comfort you, but your friend saidys “I don’t know how to feel.” and nothing else.

mood is a better word to use here.

ItThis means your friend is not your true friend and he is not an understanding person.

You canshould kick him out of your life and tell him:” ”you hurt me, bro.”

If you put should before a verb it sounds like you are giving the person an option to do something else, however, you think they should agree with you.

For example: You should read this book (basically meaning: you don't have to read it but I think it would be a good idea)
You should talk to him (basically meaning: you don't have to talk to him but I think it is the best option)

2. You are in a good feelingmood and share something with your friend and he is like thissays "I don't know how to feel".

Adding "I don't know how to feel" makes the meaning of your sentence clearer.

It means your friend just cannot getunderstand your happy pointiness.

Don’t blame him and explain why are you so happy which can havyou are so happy, this can create a deep connection between yourself and him.

3. You are in a good or bad feeling and you get a response like you said from a strangermood and a stranger says "I don't know how to feel".

This sentence is clearer

You just tellSay to yourself that dyou won’t do this again.

Use won't not don't. Won't means will not, and because you will not say these things to a stranger in the future, you need to use the future tense will not.

You don’t need to share something with strangers and want to make them understand.

ThatI’s hard and hurtless sometimful sometimes, just be the strong and ignore others' stares.

Combine this sentence with the below one.

Stares is a better word choice than eyes, if someone is staring at you in public it is not uncommon to think they are judging you. If you said you were ignoring someone's eyes people might thing you are shy. If you say you were ignoring someone's stares people will think you are being resilient (resilient = being strong against a hard challenge)

Just be the strong one who can ignore others’ eyes.

See above comment

The above are my imaginationthoughts and suggestions.

Imaginations implies creative, thoughts is a better word to use here

I hope you are doing well and escaping fromavoiding bad emotions.

escaping is a strange word choice here. Escaping implies you are running away from bad emotions, or are trapped by them and are running away. Avoiding is a more appropriate word because it sounds like you are making choices to not have bad emotions in the first place