Baby daddy drama - help?

I’ve been blessed with a little one from a tragic relationship with his father that ended around the time i was 7 months pregnant. He is the most wishy washy person ever and i don’t know how to deal. He was initially going to leave me , then took it back, so i decided i had enough. After months of arguing and years of his underhanded manipulation. I live with my aunt now who has been extremely supportive.

When we first broke up he told me he was done with me and i would never hear from again (along with our son) but then decided a couple days later otherwise. He also goes from buying outfits and asking to visit to convincing his family that our son isn’t his and further allowing them to harass me with text messages. He’s so back and forth and i can only imagine the impact this will have on our baby as he grows.

He also plays the victim as if i intentionally tried to cut him out ?

Any advice on dealing with this ?