Hi Lush,
for a year now I've been I thought I wouldn't fall in love ever again.
But a week ago I was at a party and a girl ( I know her cause we have the same classes in uni) kissed me and we had a pretty amazing night together ( no sex but super nice).
But then the day after she acts like she regrets it, so I act like I don't care that much too. But I think I love her, and I think she loves me too.
Lush, I'm scared she will reject me and break my heart trowing me back into that awful state...
Gonna be a harsh older brother here dude, so here it goes. She may have thought of you fondly and tested the waters and didn't like the experience. She may be a dick tease. She may have seen you're aloof approach after the fact somewhat disheartening. You will never know or actualize a woman's reasons, just follow your heart and do what it tells you. You will get kicked in the ass several more times in life, and a "No" is the least of the beating.
go... let her know your feeling its fine to reject that is part of a human life than to regret for your whole life not even try to tell her.