SUBREDDIT: r/relationships
TITLE: 17 M has 4 months left before things end romantically with 18F. 17M is crazy anxious.
POST: Last night, I hung out with the girl I'm in a casual relationship with. We dated for 2 months since New Years, i got dumped, but relentlessly kept seeking her, and we started a casual relationship. Lots of difference in feeling, I love her, she does not love me. Regardless, we maintain physical intimacy and affection. She is leaving at the end of July for college. She has told me she doesn't want a relationship into college, but will still have deep romantic feelings for me for a long time and want to talk to me as a friend forever. I feel like an idiot, any other guy at high school would think, girl I can do stuff with before college with no string attached? Perfect. But alas, I woke up this morning, realized I had less then 20 Mondays left with her, and promptly threw up due to anxiety. I don't want to end things prematurely, but I want to be able to deal with it so I can enjoy the last four months without feeling like this.
TL;DR: 
how do you cope knowing there is a set end to the relationship? How do you manage the stress? Any tips, advice, anything really are appreciated.