BOY BYE✌🏻 Long post but need to rant

A little back story: my ex and I dated exclusively for over a year, but broke up when he decided he wanted to deploy oversees again and both saw other people while he was gone. We recently reconnected and started seeing eachother again, and have been exclusively seeing each other for a few months now. I noticed this girl keeps posting on his Facebook (his profile says he’s in a relationship with me) like pictures of them saying she misses him with heart emojis and today while we were laying in bed I asked him about it. He said that they were friends, which is fine I don’t care if he has female friends- but then he went on to say they slept with eachother once but she was way to disgusting to sleep with more than once because “she’s a mom” and then started going on about “a hotdog in a hallway” and cellulite/stretch marks... here’s the thing, I HAD A BABY LESS THAN A YESR AGO. I have very obvious stretch marks, my boobs leak because I still breastfeed, I talk about my daughter, I post pictures all the time, I’m definitely a mom. Literally all I could say was “ouch” and than HE started going off on me for “overthinking what he said” and “being to sensitive”.

My best friend said I’m over reacting, but imma throw the whole man away. There’s no way I’m going to let a man make the most amazing thing I’ve ever been make me feel disgusted with myself, even if it did give me stretch marks and saggier boobs