My good friend. My good friend.

We met on the NAWA program NAWA in Torun, Poland. We met on the NAWA program in Torun, Poland.

I understood what you were trying to say, but it sounds better to put the program name in front of the program.

We had learned Polish language in one class. We learned Polish in one class.

The above reads much better. I might also recommend saying "We learned Polish in one class together." OR "We studied Polish together in a class."

Moreover, we had been liveding together for one year. Moreover, we had been living together for one year.

Moreover we had been lived together for one year. Moreover we had lived together for one year.

or "Moreover we had been living together for one year." - both would be correct

Moreover, we had been lived together for one year. Moreover, we had been lived together for one year.

Now we meet nodon't meet very often because i am in Poland and she is in Belarus. Now we don't meet very often because i am in Poland and she is in Belarus.

Now we meet nodo not meet very often because iI am in Poland and she is in Belarus. Now we do not meet very often because I am in Poland and she is in Belarus.

Now we meet nodon't meet very often because iI am in Poland and she is in Belarus. Now we don't meet very often because I am in Poland and she is in Belarus.

We also willwill also study in different universities next year and itwhich will influenced on our fruequency of the number of our future meetings. We will also study in different universities next year which will influence the number of our future meetings.

We also willwill also study in different universities next year, and it will influenced on our fruequency of meetings. We will also study in different universities next year, and it will influence our frequency of meetings.

We also will study in different universities next year and it will influenced on ourthe fruequency of our meetings. We also will study in different universities next year and it will influenced the frequency of our meetings.

But, luckily AGH(her university) and PK (mine) are located in the onsame city. But, luckily AGH(her university) and PK (mine) are located in the same city.

But, luckily, AGH(her university) and PK (mine) are located in the onsame city. But luckily, AGH(her university) and PK (mine) are located in the same city.

We like to watch films and thaen discuss them for a long time. We like to watch films and then discuss them for a long time.

We like to watch films and thaen discuss them for a long time. We like to watch films and then discuss them for a long time.

"than" is used for comparisons only

We enjoy to traveling and just hanging out together. We enjoy traveling and just hanging out together.

You could also say "We like to travel and just hang out together."

We can speatalk about anything. We can talk about anything.

This makes sense, but I feel like "talk" is more commonly used in this context

Kasia is a important/significant person forto me baecause I met nohaven't met a lot of people whom I am at ease around . Kasia is a important/significant person to me because I haven't met a lot of people who I am at ease around .

Kasia is an important/significant person for me baecause I met nodo not meet a lot of people whom I am at ease around . Kasia is an important/significant person for me because I do not meet a lot of people whom I am at ease around .

She always listens to me. She always listens to me.

She always listens to me. She always listens to me.

She always listens to me. She always listens to me.

And iI like how we grow personally together. And I like how we grow personally together.

And i like how we grow personally together. And i like how we grow personally together.

consider combining this sentence with the one above with a comma.

And iI like how we can grow personally together. And I like how we can grow together.