A few months ago, I moved in with my 24-year-old boyfriend. He lives a significant distance from my hometown, so he's really been the only person I've spent time with since I've been here. I ran into his ex-girlfriend about two weeks ago and we ended up spending the afternoon together. They had a messy break-up, and he still harbors bad feelings towards the relationship. I told him about running into her and spending time with her, figuring he'd be excited that I at least met SOMEONE, despite the fact that the person just happened to be his ex girlfriend. I regrettably didn't think that I might have crossed a line by doing so. He was furious. I apologized and tried to give him as much space as I could. It took about two days for him to calm down. Everything is how it was before the argument. However, we've yet to have sex. Prior to meeting his ex-girlfriend, we had sex regularly. This was also the first argument we've ever had, so I wasn't sure what to expect after things cooled off. He is still very affectionate and kind, and he hasn't been distant at all. I asked him about it almost a week ago, and he said he hasn't been in the mood because of the argument. What are some possible causes? How long should I wait until I bring up my concerns again?