Unsure situation

I slept with my best friend a few times, it was the best sex I’ve ever had 😍

He didn’t want anything serious at the time.

I started dating someone new, and we are boyfriend and girlfriend now 😊 he’s really great but the sex isn’t that good, it’s not really getting better to be honest. He lives about 30 minutes away and is different to who I usually date. I really like him but the sex just isn’t really exciting me, and personally it’s important to me.

Me and my friend have a kind of sexual tension, and we get along really well, and he’s looking for a relationship now. He said he’s jealous because I’m with someone else.

Part of me wants to break up with my boyfriend and get with my friend but I don’t know if that’s right.

What should I do?