Financing My Own Heartbreak

I, 27 year old male, found out my girlfriend, 26 year old female, was cheating in

probably the dumbest, most random way possible. We'd been together for almost 3 years.

We lived together, split bills, and shared a joint credit card for groceries and small

stuff. I handled most of the payments because I'm better with that side of things.

Everything was fine, or at least I thought it was. A few weeks ago, I got a notification

from the credit card app about a charge from a restaurant I didn't recognize. Normally I wouldn't

think twice, but it was for dinner for two at a place she and I had just talked about trying.

I asked her about it later that night, and she said she went out with coworkers after work.