Disrespectful or not?

ok i have a son by my ex boyfriend of 4 years we broke up when i was 7 months pregnant but decided to do the co parenting thing first and now it still ok coo but hes starting to let his dirt air even tho we were broking up we still kinda never just broke it off he wants to make it work but im like no cause the problem in the relationship is the same recently slipping on his parenting skills i try to have a convo with him about dating omg he got mad but i dont understand y cause that's what he been doing all along that's fine but dont have my son around them and if u do have enough respect to at least tell me if not introduce me he said hes not bringing our son around nobody whatever so i did an investigation where i found some girl who had pictures of my son on her facebook that i didnt know of and that threw me back im sorry i did not like that at all if u wasn't a shame to introduce them our son then why me and this has been going on for months i asked he denied until i told him i talk to the girl all he said was im sorry i sent the girl a message no disrespect just wanting to know how long have she been around my son she starts telling me how much his father loves him and wouldn't put him n harms way ok i know that but im lost on understanding what does that have to do with me asking a question about my son i just wanna know how others feel about this