When he says he doesn’t want a relationship ship and is in a relationship 3 months later with another girl?

I feel so sad and hurt because I was dating this guy for over a couple months and was so into him. It got to a point where I wanted to be exclusive and he wasn’t ready and in a further conversation told me that he wasn’t sure if I was a rebound from his last serious two year relationship that ended 2 months before we started dating. About a month after we stopped talking, he posted this story indicating he likely had a girl at his place and 2 months later I saw he was in a relationship on his fb profile. I only looked because I saw the same day he liked my gym photo on my ig story which we weren’t even friends on. Later that same day, I got curious and saw it said he was in a relationship. I blocked him after that but checked his profile a couple days later and no longer was the relationship status shown on his profile. However, I can see the same girl likes his photos every time he posts and he posted a story with her yesterday so he’s definitely in something. I’m sure I sound crazy saying all this.

My ego is just hurt and my feelings are bit over guys not wanting to commit to me. They all say I’m nice, pure, innocent.. but they never commit. The only hang up is that I don’t like to give myself over too quickly to guys and honestly would prefer to wait until marriage which most guys don’t appear to. All of this has made me feel undateable and make me feel like something is wrong with me and I’m boring and a hopeless case. I dated a guy shortly after him who said he didn’t catch feelings. I’m giving up on dating all together. I just hate being made to feel like a fool and I’m not good enough which I always care too much and that feels like the problem too.
When he says he doesn’t want a relationship ship and is in a relationship 3 months later with another girl?
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