Need advice

My boyfriend and I have a long distance relationship. He own his own business so I know he gets busy at times. He deleted all our pictures of his Instagram and I also found msg from this girl asking him what he’s doing and he’s telling her she looking the same and she responded “I look even better now” umm wtf so I woke his ass up and ask him about it he’s saying they didn’t meet up or anything and I ask why he deleted our pictures he said because his mom was talking shit. My guts is saying other things not to believe him but he said I’m being paranoid because I’ve been cheated a lot in the past. I’m trying so hard to trust him. Idk what to do. I have a son from a past relationship and he calls him dada n they have this bond it’s like I don’t exists when he’s around. It’s makes me so happy to see my son happy because his dad just ghost him. Idk I really don’t want my son being disappointed and I don’t want to have different guys in his life. Please help, should I believe him or leave