I (26M) fucked my ex (24F) after running into her at a party, and afterwards found out she has a new boyfriend [MF]

I dated Katie (not her real name) for a a couple of years when we were in college. We got along well, and we were in love for a time, but I ultimately realized she wasn’t the one I wanted to spend the rest of my life with. I initiated the breakup but I think the feeling was mutual. It wasn’t easy, but we stayed civil towards each other, and besides hooking up a couple of times during the aftermath of the breakup, we’ve been completely no contact. That was a little over 2 years ago, and I rarely go on social media, so I literally have had no idea what she’s been up to.

Anyways, on the fourth of July weekend, one of my friends was hosting a party originally for close friends and family… and to say that it got a bit out of hand would be an understatement. A lot of friends of friends were invited, and by the end of the night there must have been 100 people crammed into his place and overflowing into the yard.