Don’t really know

I’ve known this guy for about 3 years now, we live like 5 hours away and never met in person. We Snapchat each other quite a lot, but some times it gets abit more friendly and we exchange nudes. (I never show my face in them) I recently found out that he’s been in a relationship the entire time, he’s a lovely guy though I feel awful for doing what we do. I can’t just forget him either, don’t really know what I’m getting at, but just wanted to know if anyone’s got any ideas what to do? 🤨