My wife keeps leaving me and coming back. Can I divorce her the next time she leaves?

In this episode, Dr. Betters answers the question, "My wife was diagnosed with bipolar and she refuses to admit it, therefore she is not medicated. Over the last 4 years she has left me (and our daughter) several times. Each time she tells me she wants a divorce and I tell her I don’t want a divorce so she leaves. Then, a few months later she apologizes and wants to come back home. Every time I take her back because isn’t that what Christ does for us? My question is, would it ever be okay for me to say, “enough!” Can I ever go through with a divorce?"