maybe u look liked u were flirting in his eyes...sometimes we flirt n we dont even kno it..if u really love him maybe u should of sat down n talked about his jealously & if he doesnt stop then tell him its over...but jus breaking it off jus cuz hes jealous, doesnt sound too right...If a guy TRULEY loves u, he will get jealous (even for the smallest things) not saying thats healthy, just sayin it does happen....I kno my bf gonna get hella jealous when I lose weight cuz im a pretty big girl n get guys attention all the time..hes jealous right now lol...buttt I sit n talk 2 him all the time I tell him I kno u love me but if u get jealous/mad 4 every little single thing then I cant deal wit it and its gonna b over...so now he knows 2 control himself...good luck 2 u n hopefully ur ex changes, if not, find a new 1