I think that all this depends on what you are willing to tolerate. Being depressed is one thing but lying is another. If you can't trust her as to who she has been with, can you trust her with other things? I don't mean to sound suspiscious but If nothing was going on, how come she hasn't introduced you to her new friend. Would she like it if you did the same thing?
You might need some counseling to get through her depression. I could be way off base, one day at a time I guess. I just don't like dishonesty.
I hope that this helps some.
fibromyalgia, Chronic fatigue, depression,allergies