PLEASE HELP!! 😭

Hi girls so I’ve been with my boyfriend for a year an six months, I am so deeply in love with him and so is he. We’ve been kinda rocky recently because out of nowhere I get really dry and push him away. The reason I started doing this is because I’m very very very insecure and whenever I see him post about some celebrity girl and how fine she is or whatever I get REALLY insecure about myself. I’ve also told him how i don’t like that he posts about girls, he stopped for a while and started again. He tells me everyday that im so beautiful and fine and sexy and a baddie but i always shoot him down bc i rlly don’t believe it. So we been on a break since Friday, because he told me I should work on myself to be less insecure so it doesn’t leave a strain on our relationship and I was ok with it. He’s always telling me how much he loves me and all that but deep down I don’t know why I try so hard to convince myself that he’s talking to other girls. Last night, he posted a snap of him and this other girl. He was jus sitting on the couch and it was half of her face and she was holding up a peace sign. Me, feeling so so soooo insecure of course I was crying for a good 20 minutes. I don’t really know what to think of this? Is he cheating on me? Or not? And also we agreed that on our breaks we are together and everything just not communicating for a little bit. Please help and think of this realistically because I’m so insecure and overthink so much idk what to think now. Thank you SO much 💛