Okay so today i was walking in the mall with my boyfriend, we were holding hands and all of the sudden he rips his hand out of mine and crossed his arms and then covers his face, i asked him what was wrong and he says we just passed kylie (his ex) and he just muttered "i cant, i didnt want to see her" and for the rest of the time we were at the mall he kept looking around and wouldnt hold my hand or show any type of affection. I asked him about it later and he avoided the question and got all quiet again. Should i be concerned??