Baby’s father ignoring us

So my my baby’s father I dated him for 3 years and we broke up c he cheated on me while I was pregnant . my baby is now 8 months old . The girl he cheated on m with need to getting pregnant and she just had her baby 3 weeks ago .

We got closer after our baby was born and we both agreed that we don’t wan to go to courts to split everything up . Bc I didn’t want the court let him bring my baby around his gf bc she threaten me , and he didn’t want me to put him on child support . So we switch off every other weekend. I only had her for two weekends bc I was having a Christmas party which he was invited to but decided not to go and he told me that he wants me to have her for that weekend .

Since the baby was born he called me once to tell me the baby was born and that was it And that was about 2 weeks ago . He told me he would be back this weekend to watch her and he still not back . I texted him and called him and I’m blocked . When ever he’s with that girl he blocks me so if there was ever emergency with our daughter he wouldn’t know . This is his second week missing our agreement this month and I’m just really irritated .

I mean I love having my daughter with me at all times but she needs to see her dad to , but she also needs a consistent one to . At this point I just don’t want him in her life at all if this is how it’s going to be.

If you were me what would you do ?

He also didn’t sign the birth h certificate so I can’t just go to court with out paying for a DNA test which I don’t have money for .