Hey, Reddit. I’m a 23-year-old guy, and I recently found myself in a situation that I can’t seem to shake off. I need to know if I'm the asshole in this situation.

So, I’ve been dating my girlfriend “Emily” (21F) for about a year and a half. Emily is amazing—kind, funny, and we have great chemistry. However, things have been a bit rocky lately. We’ve both been busy with work and school, and I started to feel like our relationship was stagnating.

During this time, I ended up spending more time with Emily’s older sister, “Sarah” (35F). Sarah is a single mom, and she often needed help with her kids. I initially helped her out of goodwill, but as the weeks went by, I found myself drawn to her. I know this sounds cliché, but Sarah is stunning, confident, and has an energy that I just can’t explain. She also has a way of making me feel wanted that I felt was missing lately with Emily.

Well, one thing led to another, and we ended up sleeping together. It felt exciting and new, but I knew I was crossing a line. I didn’t tell Emily because I didn’t want to hurt her, but the guilt was eating me alive.

The twist? A few days later, I found out Emily was planning to surprise me with a trip for my birthday and wanted to introduce me to her family, including Sarah. I panicked. I didn't know what to do. The guilt was killing me, and I started thinking that maybe I should confess. But then I wondered if it would be better to just keep my relationship with Sarah a secret.

At the same time, I started feeling that I wanted to end things with Emily. Despite the good memories we have, I wasn’t sure if I could move past my feelings for Sarah. We are in completely different stages of life—Emily is still figuring things out while Sarah has experienced a lot more.

Finally, I made the decision to break up with Emily. I told her that I needed space and wasn’t sure if I was the right person for her. She was understandably upset and confused, but I didn’t confess to cheating. A few days later, she reached out, wanting to talk. I knew I would have to face her eventually, but I wasn't sure if I should come clean before meeting her or try to keep it buried.

So, Reddit, AITAH for cheating on my girlfriend with her much older sister? Should I confess now, or should I just let it go and try to move on with Sarah? I really need some perspective on this.