My (21F) and ex (23M) broke up a couple of months ago after 3 years together because it wasn’t working out. He wasn’t ready to commit and kept talking to other girls, etc throughout the relationship. Anyways fast forward, we’ve been hanging out a little bit, neither of us wanted a relationship I don’t think. Fast forward to last weekend, his friend (and his girl) and I all met up at a local event and one thing led to another. What the fuck do I do. I cut it off with my ex completely but don’t plan on telling him as I don’t see why it would be his business but I also know it would very much upset him if he knew so I don’t think that’s a healthy relationship between him & I.