Expecting #2 - not planned

I have a unigue situation. I currently live with my moms and they have custody over my niece and i have my son. We have always raised them together kind of a village band together type thing. It works for everyone involved. Now they are turning 7(f) and 6(m) this year and about 3 ish years ago my best guy friend who is really close to one of my moms moved in and was crashing on our couch. We then moved and he got his own room. Then we moved again and had to share a room with each other as a sacrafic for the kids. I have ALWAYS been very clear with him. I dont want to be anything more than friends yada yada and he was what i THOUGHT always ok and clearly accepting and even told me that he is happy to be whatever i allow him to be in my life. Well ( i fucked up) our luving situation got REALLY stressfull. Im talking 2 kids and 2 really old people who are basically acting like kids and then my moms and then me and my friend all squeezed tightly together in a freaking 3 bedroom house. My friend had been off and on constantly telling me sex is a great natural stress reliever...um duh i know how to pleasure myself thanks. Well i called his bluff on how good he was and we had some rockin sex for about 2 weeks MAYBE 2.5 weeks and now im pregnant....i made sure to tell him before he EVER TOUCHED ME that this does NOT CHANGE ANYTHING .... heavy sigh. I got pregnant... all of a sudden he is acting like we are a couple and this that and the other to the point where i sat him down and told him NO for the millionth time in the last year alone. He was heartbroken and it escalated to me even apologizing for being sexual with him. And now he is posting cryptic shit on facebook like he is a provider who never wants to go home because he is unwanted and boohoo him. Like sir!? We carry YOU i ruined my credit to help YOU wtf do you do ever? Anyways i am super frustrated and he already has like 9 children from a million baby mamas that he never sees nor fights to see. The oldest he only sees when WE ask the mom to see him. I am beyong frustrated and we will be seperating rooms because i doubt he will ever leave even though i told him not only as his best friend but as one human to another its not healthy to live for the "maybe one day we will be together" shit i wouldnt wish that for anyone. But i literally have to watch EVERY SINGLE THING I DO because he runs and i mean ruuuuuuns with it like there is hope even if its me asking for a drink. I dont know what to do anymore and i feel like its ruined our friendship LIKE I TOLD HIM IT WOULD. Im very independent so i have no problem never asking him for anything because he literally takes everything like its a hidden message of me wanting him....sorry long rant...any advice? And yes, both of my moms have told me when i no longer find any of it funny i absolutely have the power to ask him to leave.