Looking for some advice on my partner

Please don’t give hate.

My partner and I have two kids together and he says I have issues worrying ect but I don’t worry because I feel like it I feel like I have reason to. I mean idm if he wanna like girls pics on Instagram but he says he doesn’t fancy them well why tf you liking 3-5 pics while I legit just had your child? I have spoken to him about it and I just get the same answers ‘I’m bored of this now you need to stop worrying about it’. He then goes telling him mum and she thinks I’m a syco like wtf? I ain’t even doing anything wrong. What can I do I don’t really want to leave him but it’s annoying now!