what do you ladies think

Victoria
So my ex and I are still fuckbuddies, but we've come to the agreement that we can obviously have sex with other people 
He was a virgin when we were together and I had been with two guys previously
He had had sex with about 4 other girls (who he divulged he doesn't even know their names) and waited weeks to tell me 
I just recently told him I've had sex with one guy who he had said he wasn't even friends with before I had sex with this guy (we run in a very small community of people we know and agreed to not fuck friends) 
Now he's saying I "betrayed him" and I'm apparently a slut now. But the thing is, I don't feel that bad about it. Should I?