Vent- I’m single but feel like I cheated. I slept with someone else

So I’ve been single for over a year now. About a month ago I started seeing someone, he was the first person I’ve actually had feelings for (beyond sex) since my last breakup. It’s going really well and we’ve been very open with each other about where we’re at emotionally. He decided he’s not quite ready for a relationship yet but wants to continue seeing me. This was because when we first started talking, his ex found out somehow (they broke up 5 months ago) and she’s been harassing him like crazy since. I agreed and let him know I don’t want to get into anything if he’s not ready.

I also have a ‘friend with benefits’ guy that I hadn’t talked to since I started developing feelings for the other guy. Recently he’s been practically begging to come over, so I finally let him. I wasn’t really interested but he was persistent and we ended up having sex.

Now I feel like crap because I feel like I cheated. I know I didn’t but I feel like I need to tell the guy I’m seeing. I’m afraid that if I do though he’ll lose interest in me 😕