Am I the problem?

It was an on and off relationship. Most breakups I initiate and now he broke it off. I overthink a lot and I get insecure. He still talks with his old crush and he has a lot of female friends in which most of them doesn't know he has a girlfriend and he won't tell them because he's very private and they never asked. Since this bothers me a lot, I overthink and bring it up to him. He will say, whoever I'm with, I'll always have a problem and that for me, whatever he does is to hurt me. He doesn't have problem with people in my life so I shouldn't have a problem with his. I understand that he is private and he never denied me when some asked, also never made a reason for me not to trust him, but idk I still doubt him and I know this will stop once his friends know about me but he won't. So of course he got tired of me always asking to tell them or me being bothered when I see him texting them especially that old crush, he broke it off saying I am too much and that I never changed. Did I push him away? Is my insecurity and overthinking the problem?