I was about to get out ofleave the classroom but something inside me was telling me that Ray was acting in a strange way.

He usually is distracted and calm but I caught him looking at me a couple of times and he, immediately looked away and then blushed.

But todayToday, however, I realized the true reason why he was acting in that way.

He got up from his chair and asked, "tTeacher, do you have onea moment, please?"

hHow did he discovered that?

"Did" is past tense so we use the infinitive form of the verb after it.

I tried to hide my surprise and act likeas if nothing was happening but it wasn't possible.

However, I didn't want to loose my job, however.

This has already happened to my coworker and I didn't want to be the next.

I searched for the best way to say "no" in a way that wouldon't hurt his feelings.

I caouldn't help but hug him and whisper into his ear, "Ray, I am really sorry, but I am your teacher and going out with you is... not athe right thing."

I sighed and then I said, "I will keep hugging you until you stop crying."

aww! How sweet!

It was 18:00. / It was 6 o'’clock.

The second is more natural!

I was about to get out of the classroom butleave class when something inside me was tellingtold me that Ray was acting in a strange waly.

I’ve made this more simple, and native-like, but it means the exactly same thing as you’ve said!

He’s usually is distracted and calm but I caught him looking at me a couple of times and hebut he would/he’d immediately looked away and blushed.

It is best to try not to separate any possible contractions in English (you put usually between He’s) as natives try to shorten things and this has become commonplace word order.

The phrase is ‘a couple of times’.
“I’ve watched that show a couple of times.”
“I’ve seen her a couple of times.”
“I caught them talking to each other a few times.”

I thought that it was normal, after all, he is’s a fairly shy person.

This is with your formal/sophisticated reflective tone, it’s more consistent with your style. Your attempt was much more natural / colloquial.

But today I realized the true reason as to why he was acting in that way.

Sophisticated

He got up from his chair and asked, "teachersir/miss, do you have onea moment, please?"

At least in Australia, we are quite lazy and just say sir/miss. For us, teacher is too formal, and in general it’s only something I’ve commonly heard in dubbed Japanese anime.

"Sure, is there any problemthing I can help you with?"

More natural

hHow di’d he discovered that?

You don’t need to repeat the past (did/discovered), it’s clunky and a native wouldn’t use it and doesn’t make a sense. I’d say the equivalent is conjugating the second infinitive in Spanish when you’ve got two in a row.

I tried to hide my surprise and act likeas if nothing washad happeninged but it wasn't possible.

It’s either “as if” or “like”

Saying “was happening” implies a present progressive, thus that the act is happening now. It is best to use conjugated imperfect hacer + past participle, so had + past participle !

However, I didn't want to loose my job.

Loose = loose shoe, not tied tightly

I searched for the best way to say "no" in a way that don'wouldn’t hurt his feelings.

Hypothetical/reflective wish of the past, I suppose (?) requires the subjunctive here. Of course subjunctive is a difficult thing to explain, but if you need further help lmk.

I can'ouldn’t help but hug him and whisper into his ear "Ray, I am really sorry, but I am your teacher and going out with you is... not athe right thing to do."

Can’t is present.

The saying is as I’ve corrected it.

It was 186 o'clock.

in the US we don't use the 24 hour clock, so to say 18 o'clock sounds a bit odd to me

I was about to get out ofleave the classroom but something inside me was telling me that Ray was acting in a strange waly.

He is usually is distractedquiet and calm but I caught him looking at me couple of times and. When I looked back he immediately looked away and blushed.

But today I realized the true reason why he was acting in that way.

He got up from his chair and asked, "tTeacher, do you have one moment, please?"

hHow did he discovered thatfind out about my trip?

However, I didn't want to loose my job.

ThisAnother coworker lost hais already happened to my coworkerjob over a similar situation and I didn't want to be the next.

I wasn't certain what you meant by This, so I made my best guess

I searched for the best way to say "no" in a way that wouldon't hurt his feelings.

I caouldn't help but hug him and whisper into his ear, "Ray, I am really sorry, but I am your teacher and going out with you is... not a right thing."

I sighed and then I saidcontinued, "I will keep hugging you until you stop crying."