I broke up with my boyfriend recently, for a lot of reasons, but partly because I felt he just didn't care whether we were together or not, or that he was pretending he didn't care. I was just over it, but I had been in a bad mood all week and so I wasn't torn up about it or anything. The thing is now that I'm feeling better, I really regret doing it. He looked really sad when I told him, like he was about to cry. I know this sounds weird, but I don't really know what to do because I've never broken up with somebody before. Is it natural to feel guilty, or should I actually be feeling guilty because I was in a horrible mood when I did it and therefore not thinking straightly, and it was actually a mistake?