Seeking love and jealousy advice...

Rachael
Three days ago I got back together with my ex after three months apart. We had been dating for ten months before he left and broke my heart. I took him back because he seemed sincerely sorry and ready to really commit to our relationship, but I stupidly asked if he'd been with anyone else while we were apart. Of course he had (so had I), and I thought I could be fine with it because we had both needed to explore being with other people, but now I can't stop thinking about it. He had sex with two other girls and he went out with one of them multiple times. He told her about us and they're still friends. I went out with one guy once and figured out sex just wasn't them same without love so I didn't pursue anything more. I don't know if it's jealousy because jealousy is angry and heated and I just feel kind of hurt and uncomfortable. How do I let this go? I logically understand why he did it and he's said he's committed to just me now. I don't want this to become some elephant in the room, but I'm not sure how to let it go emotionally.