On mobile sorry for any formatting errors.

So we still live together and have been fairly cool for the two months after I broke up with her. (Long story surrounding that, I can go into it needed but I don't think it's relevant.) I broke up with her because I wasn't comfortable being the secondary relationship to someone who will be in prison for another 23 years.

During the year we were together they had phone sex a handful of times that I was home, and it always bothered me. So right before I broke up with her they agreed to not have phone sex while I'm home and things were ok. Because the breakup was situational we still care about each other and for a little while still had sex, up until a few weeks ago when she wanted to stop that.

Apparently for the past two months they haven't actually been able to have phone sex due to the prison he was in. He moved prisons last week and now has some more privacy to... Do stuff. Awkward considering I'm now unemployed about the same time he moved and am now home all the time for at least a few weeks.

So in combination with me not being gone, she had just finished ghosting him because the move made him irrational and she wasn't wanting to deal with it (guess who handled him during that time) and them not having done anything for a couple months they were antsy.

Me and the ex had spent most of the day together, and had gone home to drink a few beers and get high. Which... Gets her rather horny. So he calls and she goes to the other room. I don't think anything of it, cause he prefers privacy when calling and that's ok, and just pause the movie we were watching.

Then out they were getting it on even though they agreed not to when I was home, she claims she was trying to be quiet and to be fair I didn't hear anything until the dryer turned off, then I could hear her vibrater throughout the apartment.

So I go to get door, knock a few times before she even acknowledges me, then when she gives me a passive aggressive 'I'm on the phone' I just reply 'we talked about this'.

She does stop after that but the damage is already done, my mood is shot and we argued for a couple hours. To which we just gave up and went to sleep. But I wanted to sleep in my own bed which I guess is her bed until the lease is up but we still share every now and then.

So as we're cuddling I hold her close because physical comfort is nice even though I'm not feeling well. Then I guess she was still horny because she mentioned that the way I was holding her made her aroused. So I go for some angry sex after verifying she was actually ok with it. (Drunk and high the both of us... So I guess not even real consent at the time, but when we woke up she said it was ok)

This morning had a speaker phone conversation with her and prison guy which was... Explosive. Basically amounting to I was an asshole for interrupting and doubly so for having sex with her after. And he's also mad at her for having sex with me.

TL;DR: interrupted my ex GF having phone sex with her prison fiance that's existed before me, ended up having sex with her myself after a couple hours of arguing.