Could use some advice

I feel like I’m pretty, smart, educated, hardworking, and I take care of my man the best I can! I feel like I’m a good girlfriend to him when I really think about it. We never argue! Misunderstandings? Yes, but never arguments. He makes me happy I’m starting to fall in love with him! And the more I feel like I am the more insecure I get! I’m constantly asking myself am I good enough? can he find better? Am I fat? Did I look ugly the last time he saw me? Am I being annoying? Does he really care for me the way he says he does? Does he not wanna talk to me and is he forcing himself to do so? I’m constantly scaring myself with “he’s gonna leave me one of these days” I HATE having these negative thoughts, but I feel like it all goes back to my ex. My ex would leave me for any little reason and I had to be the one begging him to come back and when he did we would be happy, he’d tell me sweet things! He made me feel amazing! Just to break up with me again and the cycle continued. No, my boyfriend hasn’t done either of those things but it’s almost like I’m waiting for it to happen. No, I haven’t expressed to him these thoughts or feelings I try to act as normal as possible! And yes I understand I sound very insecure and clingy but I would really appreciate some advice..because I really need it, thank you