what do i do when a neighbor ive been going to their church start buddying up with a neighbor thats abusive to me?

    ive been going to this church that this guy in my building goes to, only one i know of thats open right now, lately hes being real chummy with my neighbor next door , she has been really abusive to me screaming at me, calling the police twice on me for slamming doors i never slammed. she can be really mean, yesterday i think she went to his apt for a bible study, i saw him give her a bible and i think they went to his apt, i was supposed to go but he knows i dont want to be near her. i dont want to be in close quarters with her, like in the same car on the way to church or even in church itself. i cant control what he does but was wondering if i should quit going if she goes, any suggestions? im trying to keep my space cause i dont want to be around an abusive person