Today was the first day of school and I saw my boyfriend?

Today was the first day of school...and we got off early so I asked what my friend was doing and she said "Oh going to sing karaoke, do you want to come?" and I didn't really want to go so I said "Its alright. Have fun though." then later when I was leaving I see my friend sitting in the cafe...and then I just left with my other friends...then my friends were just standing outside so then I went inside to talk to my friend that said she was going to go sing karaoke and I see her sitting there with my boyfriend and other guys...then my boyfriend sees me and motioned me with his hand to come over. So I walked over there and then my boyfriend was acting weird he had his hood on and was holding onto it really tightly around the neck...then my friend shouted "Look at his hickey!!!" and she doesn't know were together. Then he looks at her and was like "I need to talk to you.." and pulled her away and I'm pretty sure that he sid something to her about me. What do I do now?