We have been dating for 5 months. I love her too much and I know she loves me. But before me, there was a guy who made my girlfriend suffer for 6 years. They broke up 6 years before, and my girlfriend was sending her messages for last 5-6 years as a habit. After we start to date, I saw her checking his Facebook and one time she send him message on Facebook asking where are you why you are silent. I speak with her and she said to me I did it because 6 years I suffer you can't understand, and when I look his photos I look without any feels. After that I left her, she beg me for 10 days, she come to my house etc. I comeback. After all these, her ex add her on Facebook once, she rejected. But I still have doubt about she loves him. Any comments?