OT, but one of the best things I've ever done, religion-wise (and I'm not saying which religion), was to really and truly forgive a college "friend" who suddenly lashed out at me.* I had "forgiven" people before by convincing myself they were really just starved for attention, or had a bad life at home, or didn't know any better, but this was the first time I ever really meant it and didn't try to tack on "I forgive you . . . because you're just too pathetic and pitiful to stay mad at." I astounded a few people who knew the whole situation, but the wonderful thing was, the whole incident didn't stress me out any more, and he started actually being nice to me again. Not just pretend-nice. I think I need to find someone else to get mad at so I can do that again sometime :-)
* He was the head of the committee to review our dorm's charter, and I volunteered to be on it too. We had exactly one meeting, where it was clear he expected everyone to approve the charter as it was currently, with no changes. I had brought a page or two of things I felt needed to be changed, and essentially ended up leading the meeting to revise wording. That next week he sent me some scathing emails about how he always thought I was bossy** anyway, he never liked me, and he wished I would just leave him alone. Unfortunately, he was one of my sister's best friends at the time (she was also in our dorm) and I knew we'd be living in the same building for the next two years.
** Ever notice how men/boys are never "bossy?" Only women or girls. Once my roommate pointed this out to me, the word didn't bother me anymore. In a male it would be "assertive."