Does he still think about his ex?

Kenzie
Hi I'm Kenzie. I was facetiming my boyfriend and he called me "gabbs" which was what he used to call his ex girlfriend. He didn't even realize that he did. I have been really emotional since I just started my period, but I stayed quiet. I don't know what I should do. Should I be mad or just brush it off? It just makes me wonder if he still thinks about her.??