BF makes me feel insecure

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Background info on the relationship:

After 7-8months of dating I found out he did not really consider me his girlfriend because we didn’t have “the talk.” Found out he’s been having unprotected sex with other girls on okc and tinder, when I asked him about it he lied and said he’s been only seeing me, that I’m very special to him and that he loves me but it kinda felt like he was saying that to keep me. He’s the first guy I really fell for, who got me to say “I love you” and really show my emotions. So yeah... I took him back and it’s been good but if this is not a healthy relationship I need someone to slap me out of it.

I have insecurities like normal people, mostly about my body (my weight fluctuates easily). Right now I’m 5”4’ 127lb (I would consider my body as healthy) Usually I’m a confident person and always admired beautiful women rather than being jealous. However, since I met my bf I could tell his usual type is slender, thin, pretty bony girls which i also find pretty on a lot of people but lately I’ve been seeing them as danger to our relationship. He makes comments when he sees a hot girl or any slender women really (age does not matter, up or down😑) and checking them out in a very obvious way that makes me feel uncomfortable and jealous because I like him a lot. Now when I look in the mirror I don’t feel fit enough. It makes me nervous sometimes just to go out with him because I know I will have to deal with that internally. It’s so hard feeling like this because I haven’t been this anxious in a long time and I feel like it’s for stupid reasons. Also I have felt with depression so it’s easy for me to spiral out of control. I guess I don’t trust him with other female and feel like he can’t keep it in his pants. Since I’be started seeing him I’ve lost body confidence.

How do I get over this anxiety or am I just not in a healthy relationship? HELP!