Well sit her down and have a real heart to heart talk, ask her to really explain herself and how she feels about you and not just some shallow answers, tell her she has to change and invest more in your relationship and if she doesn't give any effort why stay with her? tears and professions of love are nothing without action. bpd isn't an excuse.. if she really cares for you she wouldn't treat you that way especially if you tried to reach out multiple times..dont be a doormat.