It’s never comforting to see someone you recently dated with a new person. It’s perfectly understandable that you’d feel some type of way. Now if you ran into him 5 years from now and felt jealous, that would be weird but not if it’s recent.

Now about you wanting him to pursue you. That’s again fantasy v reality. Fantasy is him realizing his wrong ways, deciding on a serious relationship, falling madly in love with you and living happily ever after. Reality is he’s kind of a loser with no proper job or place to live in his 40s, likely a stoner, and someone who wants to have casual fun with women and no commitment. Is that the best you can do being with a guy like that? Obviously you could do better. In fact it’s commendable he didn’t pursue you further as he knows he can’t give you what you want so why would he push for it?

Him dating other women doesn’t mean much. They either would want serious like you did and will bail since he’s not interested. Or they are ok with casual, which you aren’t. So it’s not like he chose other women. You made a choice of not being with a playboy so honor your choice and hold your head high.

Whatever you feel is valid. As long as you don’t act on it like contacting him again etc And I think I’d ask friends not to report to me what my exes are doing. That’s unnecessary drama.

Btw that woman sitting by herself on a couch reminds he how he’d go to concerts supposedly with you but then ignored you there or not even hang out by you at all. And that’s after sleep over at your house! What else is new. He shows women exactly where they stand with him. Eventually everyone catches on to that.