I need some advice from people who have had similar experiences

Ive been in Ireland for 4 weeks, and im going back to spain in 12 hours at the time of writing this.

For these 4 weeks, ive been working as a volunteer for a charity shop, whilst staying with a really nice host family. And, from this past monday to Friday, ive been able to hook up and spend so much time with a german girl. She has been my first kiss, and the first girl to tell me she likes me.

Yesterday night she stayed over where i was at to spend the night and it was amazing, but ive had to say goodbye to everyone this morning, and i miss everyone from the charity shop, the other volunteers, my host family and the girl even more.

What sucks is she still has 5 to 6 more weeks in ireland, and after that she is going back to germany where she still doesn't know what she will end up doing since 9 of the 12 universities said no to her, so she doesnt know if shell have to move somewhere nor when. So, its currently 00:30 am as of writing this and i cant sleep because i miss everything so much already, but i miss her the most.

What can i do to "cope" or get through these lonely and sad emotions?