I am just so frustrated right now. so my friend added me on instagram and she's friends with my ex/…

I am just so frustrated right now. so my friend added me on instagram and she's friends with my ex/ daughters bio father. well then he sent me a request and when I go to look to see who it is I seen it's his instagram. now usually I would ignore it and be what ever but the first picture I see on it is a picture of him and his other daughter with a quote "she is why I live." it's not the fact that he is spending time with his other daughter but it's the fact that one there are litterally 0 pictures of his FIRST born daughter and he does not mention her in anything. and that he can pay that child support (his other baby mama told me so) but he xabt pay this child support that has behind $6000 and hasn't made the last 3 payments (mind you it's only $50 because "that's all he can afford") it's just upsetting because of he doesn't see her as a daughter then he should just sign his rights away and he won't have to worry about child support for her anything like that but he's one of those dead bears who sits there and tells the mom that they love the child, need the child in their life, but NEVER does anything to help support that child!!!