[onetwo_threefour]

Sounds like it's probably a stalking offense (criminal harassment) they're considering charging him with. Presumably they'll give the recorded interview to the Crown who will determine whether the totality of what he did constitutes the elements of stalking. At first read it sounds like it probably does constitute harassment.

Assuming that the Crown decides to pursue the charge, your gf will likely have to testify at a trial unless the guy pleads guilty.