<human>: My ex-fiancee/current girlfriend is trying hard to reconcile things after she confessed to a 3-month affair. She's 26, I'm 28, we've been together 4-1/2 years, living together 6 months.

The problem right now, as I try to decide where to go from here, is that little things keep triggering big mood swings for me. I've been on an emotional rollercoaster for the last couple of weeks, and there doesn't seem to be an end in sight. One minute, I love her and want to make everything work, the next minute I'm ready to kick her out on the street.

It's little things that set it off, too. Yesterday, she asked me for a small amount of money, and all I could think about was how I've been paying for her to cheat on me for months (she's a student, so I pay the bulk of the rent and household expenses). My first impulse was to get really immature and break things and yell, but I went for a run instead.

Honestly, I know these mood swings are a part of the "process," but they make me feel like some kind of drama queen. That's not who I am, nor who I want to be. I feel like even if we weren't trying to work things out, even if I kicked her out today, I'd still have to deal with this. What can I do to stay stable and sane?

Summarize the given text in a few sentences.
<bot>: GF cheated, trying to deal with the mood swings and anger that come out of nowhere every couple days. Tips for dealing?