Me and my partner have been together for 5 years and have a 9 month old together. I have 2 children from a previous relationship who think of him as dad as their biological father chose not to see them. When we first got together I did a background check( stalked his Facebook lol) he had things from years before with ex’s which is fine yet he refuses to add me on there, no mention of me or anything, he Is friends with ex’s family members so I think he doesn’t want them to find out and he even blocked me when I asked why. Recently my eldest asked for an Instagram account I reluctantly let him but had concerns as I don’t use it and couldn’t monitor his use, my partner was there when we discussed it and never said anything for me to then find 5 days later he has an account and I find it strange he didn’t think to say “I use it I’ll follow him” as a responsible parent would. Again when I asked it turned into a massive argument with him screaming he doesn’t need my permission to have a social media account which he’s right but why be so secretive? Am I being paranoid or would this bother any one else? I’d like to add that from his social media me and the kids don’t exist and he only posts anything when he’s away