Getting cheated on in front of my face

Date: 5/27/2018

Went to my boyfriends friends house. It was a female. I was with my friends as well. We were watching tv. When I look to say something to him, he’s getting his dick sucked by that friend. I watched as he looked at me watching and did nothing. So I said , “you know this is my boyfriend, right” and she didn’t know. She stopped and told everything to me, he’s been lying to her too. Then my whole body started to feel betrayed, like I felt a loss for our relationships life. We talked for a moment after she left and he told me he wants to have an open relationship and I said no. The dream shifted and it was over.