I [24f] just found out my boyfriend [28m]used to fuck our roommate [28f]

Together 2 years. Our lease ended in December and my boyfriend and I decided we were going to get a roommate to save money. He mentioned that his friend, let's call her Katy, recently bought a house and was looking to rent a room out. So we've been there for 3 months.

Tonight I mentioned to him that he should get me a vibrator. He mentioned that they were really expensive, and how Katy's old boyfriend spent like 100 bucks on one for her. I asked him why the hell does Katy tell you about her sex toys, and he said because they used to hook up and he used it on her.

What the fuck?? So he suggested we move in with his OLD FUCK BUDDY? I told him I was so angry, and how disrespectful that was to have me move in here without telling me, and that I don't even want him hanging out alone with old fuck buddies let alone living with them.

He said I was overreacting and he just saw it as a cheap place to live, and I said I think I at least deserve an apology. He said "the way you're berating me is not conducive to an apology." I haven't spoken to him in a day. I mean I think this is chocolate and a hand written card level fucked up. What the fuck do i do. Am I overreacting? I'm so pissed.

**tl;dr: boyfriend had us move in with a girl he used to fuck without telling me, and thinks I should apologize for getting angry. I'm livid, and I'm hurt."