When is it the right time to leave a marriage?

[chad c]

My wife and I have been together for almost 10 years, and married for almost 6. We've both made our fair share of mistakes in the relationship, and I'll be the first to admit I made the majority. We were very much a "opposites attract" couple. Now those differences...and another issue...are tearing us apart. She came from an upbringing with alot of anger. No physical abuse but definitely verbal. As it's all she's known, it's manifested itself in OUR relationship more as she's gotten older. That anger, and her emotional coldness when we do fight (she won't talk to me or let me touch her)...drove my feelings toward someone else. Now we're in counseling, and we are communicating better, but that spark that disappeared over a year ago has yet to come back....even with both of us giving it our all. I don't feel like I'll ever get it back...but I'm afraid to lose the life I've had the last few years. What do I do?