I had sex w my long term ex

After many years of not talking, we talked again because he is going to go home to PH to visit. So basically, we met and something happened to us. After what happened between us, I felt awful, like I’d made a huge mistake. It’s not just the act itself, but finding out that he's been sleeping with other women, either before or after me, when he go back to our hometown. I always knew he had a history of being a player, but I never realized how far it went. I trusted him in ways I didn’t with anyone else, and I don’t sleep around with random people, only him. Now, I feel dirty and betrayed because I gave myself to someone who couldn’t even be honest with me about what was really going on. Even though were exes, I feel betrayed because he knew who I am as a person. I feel like I was used and then thrown to the trash after being used. Because before something happened to us, were good, we talk most of the time, but after us doing the deed- he just like abandoned me. We didn't even talked about us and had closure, that is what I'm expecting too because I thought I'm gonna finally get the sincere apology from him from all the trauma that he gave to me to our relationship. I thought he is genuine because he still cares when he talks to me and he is very vocal about it before all this happened. Is my feelings valid?