How can i make my ex bff realy jealous?

short and sweet she basically ignoredme i got fed up told her to suck it and she started blaming me saying i was obzesed with her im 13 and a grl(duh) and so ii know u ppl r probably thinking * why r u asking me u dont have a life* but i wanna see what u ppl hav to say. i am immature so yeah justmplz dont waste both of our time by saaying i shud grow up.