Can your ex-girlfriend still like you even if she's dating her ex-boyfriend and has been mean to you and it seems like she's doing everything for spite?

Yes, definitly. she might just wanna get you jealouse, u have two options. play along and then win her heart.... or give her a taste of her own medicine, she'll be the one trying to win u back p.s if her bf's a jerk to u, be exrta nice, that will show her how nice u r and how much a jerk he is