Isn't this super disrespectful (I'm going to dump him)?

We've been dating for just 5 months and I'm already feeling this relationship is a total waste of time. He has no other interesting conversation nor real ambitions except his sexual experiences, the interesting clubs and likes with his 2 past ex girlfriend and sexual stuff. Within me I'm thinking ''Omg not this again, why the hell do I even want to hear about your ex gfs.''

Then he calls an ex girlfriend's mother's (yet that girl has blocked him years ago) that works at his workplace ''oh my sweet mother-in-law'' even when I told him I feel that's disrespecful. In 1st month, he used to talk about interesting topics (science, houses and a bit of politics) and seemed like he had life goals. Then it's like his mask started coming off. He's different than how I met him like.
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How would any boyfriend like it if I talked about a past ex boyfriend and the trips he took me to?
Me: Oh honey when my ex boyfriend and I use to go to the beach, we had fun
I don't think any man would like that.
Isn't this super disrespectful (I'm going to dump him)?
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