[UPDATE] I [26M] caught my girlfriend [24F] with a condom in her hand, and I'm not sure what to think

I collected a great amount of feedback from the comments section of my last post. Some of you were right on the dot, others were way off.<br><br>I [26M] caught my girlfriend [24F] with a condom in her hand, and I'm not sure what to think#####Post body- I don't know what to think<br><br>TL;DR: At the end of last year, I caught my long time girlfriend with a condom in her hand. She said it was for us, but it was expired, so we used a fresh one. Weeks later I started receiving text messages from an unknown number asking why I was with the kind of woman that cheats on her boyfriend. When I kept responding that I had no idea what they were talking about, they sent me a video of my girlfriend sucking a guy's dick. It was from the same day I caught her with a condom. I confronted her, and she told me that it was for us, and she was just trying it out. She was visibly nervous, so I didn't fully believe her and decided to do some snooping. I went into her phone and found text conversations between her and some guy. I took pictures of them and put her phone back where I found it. I then went to the nearest store, printed those pictures, and put them in her car. I left a note telling her that I knew everything and I wanted her out by the end of the week. It's been three days since then and she's still at my place. We haven't talked at all, as she's been gone all day. I saw her once when she came home in the middle of the night, but she didn't even look at me. When she wakes up, I plan on telling her I'm leaving for work, and instead go to the police station and file a report for identity theft. Once she gets a call from the police saying they've received a report that her ID and debit cards have been stolen, she'll go to the station, and hopefully be hit with a nice little surprise. I'll make sure to have a nice little gift ready for the other scoundrel.<br><br>Edit: Thanks for the support guys. You're advice did not go unheard, and I sure as hell appreciate it.