I'm so close to getting a restraining order and a no contact order against my son's father since he…

I'm so close to getting a restraining order and a no contact order against my son's father since he has the nerve to say I'm at some random guys house having sex with him when I'm at my grandma's house getting the house cleaned up for her before she came back from Indiana yesterday and mind you that my mom, sister, my cousin and his girlfriend and my uncle were all here yesterday so they can vouch that I was here all day. It's like he got so defensive cause of how I left him cause of him drinking everyday when he knows that I can go into labor at any time now and that he also hasn't once helped me with our son since he's been born and that's been since April 29th 2016