Need relationship advice

I feel pretty immature to get mad over social media and stuff, but I do and i am. Sometimes i check my boyfriends Instagram to see who he’s following now or what pics he likes and it irks me. In the beginning of our relationship I was not like this, but the more I realized I’m in love the more insecure I started being. I don’t want to check anymore because it honestly hurts my feelings when I see him follow girls and like their pics especially when I look nothing like them. I just feel like what if he’s looking for better? Or what does he get out of following girls when he has a girlfriend? I know he loves me and he’s very sweet to me but i always wonder if I’m enough or if it’s just me and my insecurities and i feel stupid! I shouldn’t let these things bother me, right? Idk what to do here this is all confusing.

I have talked to him about it in the past I’ve asked him to stop multiple times but he would always brush it off like I’m tripping he’s not doing anything wrong why should he stop? Or what am I so insecure for? And he always says that if he’s messaging them or commenting on their photos then I have a reason to be mad but he’s not doing that so I’m basically tripping over nothing we fought about this twice and when i bring it up now he ignores me cause he says we’re arguing over dumb stuff but it ends in him promising to stop, and I’ll give him the benefit of the doubt I stop checking his Instagram then I get the need to do it again and when I do I’m disappointed bc I see him breaking his promise. I don’t think he’s cheating on me but Idk i have anxiety so I can’t really trust me gut here I’m kinda mad cause I see he’s still doing it but i haven’t brought it up because i know he’s trying to be a good boyfriend and i don’t want us to fight so I’ve been avoiding the topic. Am I being toxic?