Really need advice about BD please help?

ok so right now i am 6 months pregnant and having serious issues with my baby daddy. He was happy at first when he found out i was pregnant now its like i just put such a burdon on him. He yells at me for not knowing the of the baby yet, then he calls and tells me that he can not be happy about this situation (me pregnant) and that he now wants a dna test done. Today i just found out my cousin wants my baby shower on the 9th of April and i called to get his families information so they can be invited now he has yet to meet my family and is not trying to and he told me that his family can come but since its at my mothers house he will not come at all. And that really hurt my feelings that he would do that because i want both sides to meet each other and get along and while we was arguing he told me he really just want to send a check in the mail and leave it at that. Then changes his mind and wants to be apart of the babies life and its confusing me. Guess my question is should i just leave him alone to figure it out i said i would have two baby showers but he doesnt like that either so should i tell him to just leave us alone or work it out some way where he will be in the babies life. i want my baby to know its father but im tired of stressing myself out over it also PLEASE HELP ME