I'm so jealous, I stopped constantly bothering my partner about it but it's still inside me. I can't afford therapy for now, how can I deal with it on my own?

My partner said it stresses him a lot when I start asking him all this jealousy stuff. I don't want to overthink it to the point where it actually happens. He is honest with me, I wanna trust him, but this jealousy in me is almost like some sort of OCD. "Do this 4 times or he will cheat", "check his followings, if they went up he's cheating" but I have no reasons to believe he's cheating. The only reasons I'm jealous are 1-i was cheated on in the past by other partners, 2-me and my current partner started off as fwb. But we both agreed to stop seeing other people, my partner doesn't give me any reasons to be jealous (maybe besides following girls he had sex with, but when we started seeing each other he said he doesn't unfollow unless someone goes all crazy on him)