However, throughoutduring the last few weeks, that frequency had shrunkdiminished to such an extent that we just exchanged a few text messages once a week.

I had been attending a language school for a few months and wanted to put into practise the things I had learned there.

practise is fine if you use English form the UK or Australia.

Finally, my for-then-already friend sent me a video message as a present on my birthday.

Finally, my by then, already friend, sent me a video message as a present on my birthday.

Thanks Patti for let meting me get to know you.

We had nothing in common and even so, our friendship seemed to have lasted almost a lifetime.

From the Bottom of my Heart

Capitalization fine as a title

Yesterday it was a very sad day for me.

I knew something unusual must bewas happening to my long-standing language partner.

Over the years that we haved been in contact, we had become very close friends.

Alt: that we had known each other (more informal)

However, throughoutover the last few weeks, that frequency had shrunk to such an extent that we just exchanged a few text messages once a week.

Yesterday, I sent her the simplest of the messages: “Hi Patti, how are you?” We were exchanging messages for a short time;-- nothing out of the ordinary.

What comes after ; should be a complete sentence. You can use an em dash for a phrase.

I feared the worst, and the worst was what she told me:, “I think that our friendship has fizzled out.” When I asked her what the matter was, her reply was:, “I guess all friendships aren’t meant to last, we’ve had six great years”.

To achieve that, I had to meet people, the so-called language partners, willing to practise with me.

Just as a note, practice is the American English spelling -- not sure whether you are studying another kind!

She was an English woman learning Spanish, and I was a Spanish man learning English.

Our beginning wasn’t very straightforwardIt was hard at first.

Not clear what you mean by straightforward.

Not only was it the first time I spoke with a foreign person, but it was also the first time I spoke in English.

Not to mention, I had never met anyone on the internet until then.

Finally, my for-then-already friendriend at the time sent me a video message as a present on my birthday.

Throughout these six years of friendship, we have spoken about everything.

Alt: Just about everything

I know everything, or almost everything, about her, and she knows almost everything about me.

Thanks, Patti, for letting me know you.

Alt: Letting me into your life (though this is more figurative).

Thanks for making me an improved version of my old self.

Not only were you the first foreign person I spoke to, but you were also the first bBlack person I ever met.

We had nothing in common and even so, it was as if our friendship had lasted almost a lifetime.

From the Bbottom of my Hheart

Yesterday it, was a very sad day for me.

I knew something unusual must bewas happening towith my long-standing language partner.

Over the years that we have been in contact, we had become very close friends.

However, throughoutduring the last few weeks, that frequency had shrunkdropped to such an extent that we justonly exchanged a few text messages once a week.

Yesterday, I sent her the simplest of the messages: “Hi Patti, how are you?”. We were exchanging messages for a short time; nothing out of the ordinary.

I feared the worst and the worst was what she told me:, “I think that our friendship has fizzled out”. When I asked her what the matter was, her reply was:, “I guess all friendships aren’t meant to last, we’ve had six great years”.

I had been attending a language school for a few months and wanted to put into practisce the things I had learned there.

To achieve thatis, I had to meet people, the so-called language partners, willing to practise with me.

Our beginning wasn’t very straightforward.The start of our conversations were not easy.

Not to mention, I had never met anyone on the internet before.

After a few months, we went from exchanging messages to voicphone calls.

Finally, my for- by then-already friend sent me a video message as a present on my birthday.

It was one of the best presents I haved ever received.

Throughout these past six years of friendship, we have spoken about everything.

I know everything, or almost everything, about her and she knows almost everything about me.

Thanks Patti for let meting me get to know you.

Thanks for making me an improved version of my oldformer self.

We had nothing in common and even so, it seemed as if our friendship lasted almost a lifetime.

Six years would not constitute a life time.