does she possibly have abandonment issues and feels you abandoned her by leaving the place where you both worked? idk, her behavior is definitely strange. it seems like she's definitely pushing you away and maybe even punishing you for taking another job by hanging out with this other guy rather than you. i'd just be honest with her and tell her how you feel reiterating that you miss her and want to be with her. i'd also tell her you are confused and hurt by her behavior. if she's this unstable and can't just be honest with you as to what is going on with her then it's probably best to find this out now rather than later although i'm sure that it is hard. good luck. you sound like a good guy.