I think it's absolutely wild that you are acting as if him being attracted to women who don't look like you = he isn't attracted to you (when he's been having sex with you for four months)!

I'm not trying to be mean, but to me it seems like you are feeling insecure and you're lashing out at him because of it.

He didn't cause your insecurity, he hasn't been dishonest, he hasn't taken advantage of you. Your emotions are valid BUT you are responsible for dealing with them and not acting as if he is at fault because you had an emotional reaction.

You're WAY out of line, you've been accusing him of bad motives and it seems like trying to manipulate him into feeling guilty/bad for every having been attracted to someone else. It's not good and you have NO reason to be upset with him, NONE.

This could be because you were hoping for something more than just sex to eventually develop and it hasn't. Was he upfront with you about only wanting no strings attached/FWB in the beginning?

If you agreed to FWB and hoped he would change his mind once he got to know you, then you should end this because it's not going to change, instead of acting like his attraction to other women/not being sexually attracted to you is why he won't commit.

You are worthy of love and acceptance exactly as you are. There are plenty of people who would be sexually attracted to you and some of them are seeking exclusive/commited relationships. Find one of them and while you search focus on becoming the best version of yourself so you're ready to be a healthy, secure, and supportive partner when you find them.