Why am I always so insecure?

Anonymous
my boyfriend and i have been together for 9 years and i’m so insecure being in a relationship with him. he used to follow girls on instagram, like their bikini pictures and DM a few of them complimenting them. i don’t look like any of those girls so it makes me so insecure to the point where i’m no longer nice to him. a lot of the times i just don’t want to hangout with him bc it just makes me so sad. he has apologized time and time again, but i’m so scared to let my wall down to be hurt again. i asked him why he did it and he said he’s sorry he didn’t know who he had in front of him. I don't know what to do. i hate him for doing that to me, but I don't know what to do if i should let him go or let my wall down and give it another chance. he no longer has instagram, instagram deleted his account but he does have facebook still. I don't know what to do.
Why am I always so insecure?
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