Should I be concerned at all?

[Joe]

If he thinks she's crazy you have nothing to worry about. Stalking someone only makes them look needy, so your bf is probably not attracted to her at all. He's been very honest about the whole situation, which is very good, and it tells me, again, that you have nothing to worry about. She probably wants to know what's going on in his life; perhaps she's got this "Let's see if his life is better than mine" competition going on. Or, maybe she wants him back (that's too bad. Sounds like your man is into you).

If he talks to her then I'm sure he's just curious. Trust me, no guy will put up with crazy women, unless all they want is sex.