<human>: Can you give me the gist of the text in a nutshell?

Some background to the issue first. Myself[22M], my housemate[21F], her boyfriend[23M] + another guy who's not really involved have been living together for about a year. Housemate and boyfriend have been together about 3 years. Recently they broke up but stayed amicable and kept living in the house together. The only difference in the relationship is that she now sleeps in her own bed and they don't have sex (I assume). While rebounding, the boyfriend repeatedly attempted to get together with this other girl[24F], a mutual friend of all of us who would soon become my new girlfriend. She had to turn him down several times before he really got the message. At one point he kissed her before she recoiled from him. This seriously angered her and he finally got the message as she was berating him for it. Housemate and boyfriend were close to getting back together until she found out about this. Now, housemate almost completely blames girlfriend for this and has essentially banned girlfriend from the house. I feel I should make it clear that he was in no way being led on, she made it clear she had no interest in him several times yet housemate is refusing to place blame on her pseudo-boyfriend and instead is aiming all her anger at girlfriend.

While all this is happening, I find out that girlfriend has a crush on me, I talk to her about it, and we start dating pretty much as soon as housemate's boyfriend backs off. 

My issue is that I want the freedom to hang out with my new girlfriend in the comfort of my own home. Housemate riles up at the mere thought of her and has no interest in talking it out. I've tried talking about it with housemate but she just isn't budging. And going to girlfriends house isn't an option.

How can I get my housemate to back off and let me enjoy the company of my new girlfriend in or outside of my own home?
<bot>: Housemate doesn't want my new girlfriend in the house because her (sort of ex) boyfriend had/has a thing for her