Friend is angry about something

A friend is angry with me because I recently began dating someone she used to have feelings for. She is no longer interested in him, and I am not in a relationship with him because we are just trying this out, but she feels as if I have betrayed her in some way. I am not sure how to deal with it because I don’t think I have done anything wrong. The idea of trying to explain myself as if I am the villain is making me angry, and I think I may end up losing her as a friend. The whole thing seems unnecessary, and I don’t know how to resolve it. Should I stop seeing this guy?
If it seems unnecessary, it probably is, and you should react with patience rather than anger. There are misplaced feelings at work here, but they can’t be dismissed outright without acknowledging that your friend has not been able to process how she feels yet. Try and see things from her perspective, tell her you’re trying to understand, and give her a clear idea of where things stand between you and this person you’re dating. Friendship, like any relationship, thrives when there is honesty involved, and it’s possible that your friend has misunderstood this situation. If you want to stay friends, put in the work and hope that she sees the effort. If she doesn’t, give her time and space to come around.

My boyfriend has pushed me to the edge time and again, but I don’t end this relationship because I know he loves me. Am I setting myself up for grief? Is this a bad idea?
You can’t proclaim love for someone if your actions don’t match what you’re saying. He may love you, but if he can’t show it when he is obviously causing you pain, you aren’t putting yourself or your interests first. If he knows this is making you consider ending your relationship, and that doesn’t change how he treats you, it’s a red flag.