Ex with new gf gow do ik how him and I feel?!?

MY ex has a new gf and I finaly dont feek jealous about it or anything! Heres the prob he flirts with me and talks to me a lit but then again some days he acts like he doesnt even see me. Hes slapped my *** playfully said things like id tap that and your beautiful y etx.. How do I know how he feels about me? Or how I feel about him cuz right now I really dint know? Thanks:(