I've been in a relationship with my girlfriend for 2.5 years. First time we made love after a year. She wanted it so badly. All this time she insisted I marry her. Proposed to her, everyone's happy. I go on a business trip for 1.5 months to another city. When I get back, I find out that a week later she met some guy, and on the second date she gave it to him. I'm shocked. I love her and forgive her. Then within four months, she's fighting over every little thing. Later, I find out about another affair and forgive her. A year later, another affair. I can't forgive her and I can't leave her... How to be?!