Boyfriend brought up ex while drunk

So me and my boyfriend were drinking some beer last night with his mexican neighbors. (He's caucasion & I'm mixed with caucasion & aftican american) Eventually he asked me if he could bring up his Puerto Rican ex. & at that point i was heartbroken & stuck in my thoughts asking why would you do that? i got upset & went back over to the house. I was crying but he kind of was distant and stayed in the bathroom & said he was crying in there. He finally came out and put his arms around me. I asked him why he would have done that & he said he wanted to tell them that's how he learned spanish from talking to her so long. Am i overreacting? I know he has fanasties about being with spanish women. Is he not over her? They say a drunk mind is sober thoughts??? Comments please??