My boyfriend and gay friend sleeping in same bed.

My boyfriend has a friend that came to visit us from America. They met online & had a fling before me but it didn’t work out because long distance. Hes friend been wanting to want to cudlle with both of us but its not my thing cuddling with his gay friend that he dated in the past. I have made it clear that i dont want that. One of the mornings he came in to our bedroom before I went to work & sat in bed with my boyfriend. I left them chatting and went to work. However, i texted my bf an hour later and he didnt respond and hes VERY quick to respond so I rang him and it went to voicemail. So that brought red flags in my mind… So I went home to see what was going on as I was driving by.. So I went to the bedroom and they were sleeping in our bed together! which really annoyed me as i felt like the boundaries were all broken and felt disrespected! We are monogamous & I didn’t expect that to happen. Is it normal for this kind of things to happen? Am i being over dramatic?

Update

Just for clarity. All I caught them doing was sleeping in bed. I dont think they were cuddling or done anything sexual as they arent sexual beings that much. Dont think any cheating happened. However, it wasn’t the case of them accidentally sleeping in bed as the lights were off & door was closed. Prior to this on of the nights my bf got VERY annoyed that hes other friend was cuddling the american on the sofa and then bed and thought that hes other friend was being disrespectful because they had a past & that he tends to do that often & get with people he used to date.. I didnt agree with him because both of the boys were single & it didnt mayter anymore as hes with me & he “apparently “ doesn’t have any more feelings for the American guy. But yh he went really crazy that night!