Relationship already over or did this end It?

Okay so I was in a relationship for a while , I wasn’t exactly happy for quite a few reasons within the relationship for example he was controlling, I couldn’t hangout w/ my girlfriends, always had to be w/ him, I was the only one working(except for the first 6 months of our relationship) well we had talked about 3somes before. He wanted to have one w/ another girl, I was down for either sex honestly. We both didn’t want it to be someone we didn’t know or who we thought wasn’t a clean person to be safe and everything. So we decided it should be a person we knew. Well one night a mutual friend (a male) was over hanging out we were smoking drinking. My man at the time asked if I was down I said yeah we asked our friend and it happened. Well after me and the guy we did the 3some w/ became really good friends and my boyfriend at the time got jealous and accuse me of leaving him for this guy. That wasn’t the case at all but even though I told him I wasn’t , I was sleeping w/ this guy after out relationship had ended.