Am I too jealous or should I act?

Dear Community,

I have been dating a guy for five months already, though we meet not very often and have online relationship some kind of. Once a week we meet a day or two and spend some time, have sex and talk and laugh.

He is a musician, surgical resident and have multiple hobbies and have up to 3000 friends in FB. Since we started dating I explored he used to give heart emoji’s to other women, nude ones or prone to nude ones, or having some seductive photos. I told him I hate it, he quit doing it for our mutual friends though I found some sexy seductive women he keeps giving them likes and emotions. I complained several times I don’t like it, though I doubt I can change him, lately I became tired keep telling the same, I cannot change him, I think, though it bugs me, even reconsider our relationship. It really affects my trust issues, he keeps telling he just likes them, they look nice, sexy and seductive and he likes their boobs or butt, I hate it realizing I date a person who looks constantly other women’s body…he used to be a womanizer, dated with several women simultaneously, now he is with me, I know he doesn’t cheat, but his history and his actions makes me feel bad… at the same time I feel If I go further I will find out myself being seriously emotionally addicted to him… even now I feel I have some feelings… Please suggest how should I behave?

Do I dramatize things, am I too jealous, is it normal how he behaves? i had relationships but not such close to care about other women’s existence in their lives