I have been where you are right now. I hung out with my ex boyfriend for about 6 months after he broke up with me. He was so disrespectful to me really or I let him be to me. He was seeing other women and I knew it. I could not be apart from him so I put up with this behaviour. I moved on eventually. Maybe I had to experience that pain to move past our relationship. When I think back on some of the scenarios I was in with him and his other women it makes me cringe.
I cant really give you advice in love but that was my experience.

I still have never told my therapist some of the awful treatment I let this man do to me.
Nothing detrimental but just embarrassing that I let him treat me so disrespectfully.

If you keep seeing him and are not feeling good about it I hope you don't feel bad and have the strength to be kind to your self. hugs