There are a lot of definitions for friends.

Jak tak teraz patrzę na te zdjęcia to myślę sobie, że mogłam się poczesać. A poza tym, trochę smutno.

Glad to get to know you, but it's already time to say goodbye. Thanks for all of the memories we were able to make for the last 6 months.
But don't worry - we might see each other next year!
I'll miss you for sure!