I (M34) was engaged until just a few weeks ago. She said she didn't want a relationship and just wanted us to be friends.

At the time that was all well and good and we were doing fine as friends and roommates. She made a few promises to me when this happened.

She would be respectful of me since we do still live together.

She wasn't ready for any kind of relationship for (in her words) at the very least 4 or 5 years. This one I told her wasn't an issue. If she finds someone I don't want her to put it on hold to spare my feelings.

Well a couple weeks ago (so around 1 week after she broke up with me) I found out a guy she was talking to just before she broke off the engagement she was also fucking. That hurt. A lot. A month ago I was so in love with her I'd go through hell barefoot and she just happened to find a new, I don't know? She swears they aren't bf/gf so fuck buddy?

But I try to be supportive even as she tells me about getting a hotel room for the express purpose of having sex.

Now we finally have our rooms separated and she brought him over and swore over and over they would be respectful. Apparently this means having loud sex on our bed in the next room.

I confronted her and told her how much it hurt hearing her and this new guy doing it. I try to make her understand I'm glad she found someone, and I am, but we were literally engaged not even a full month ago and she brought her new bf over to fuck all weekend. I told her I heard everything and that it was like a knife in my heart. She got mad at me saying things like "I'm sorry I found someone faster than you." And "he's not even my bf" that last one hurts even more honestly. At least if you loved him I could try to be more appreciative of what you've done.

She keeps asking if I'm ok like I'm just going to forget hearing my ex fiance having loud sex and I won't lie to her but every time I tell her that it still hurts she gets mad "well what am I supposed to do?" And "I guess I'm just a piece of shit then"

I'm so hurt and angry right now I can't trust myself to talk to her. I want to say things just to hurt her. I won't but God do I WANT to.

I know in a lot of this I'm not in the wrong (like as far as I'm not in the wrong for hurting) but AITA for telling her the truth and making her feel guilty, even if it wasn't my intent?