Jealous of my girlfriends present and past
So here's the whole story:
I have been "going out" with my girlfriend on/off for the past 6 years. Before me she had another boyfriend. After she cheated on me with him, he found out about it and there has been bad blood ever since. In the beginning, she would still be his girlfriend and ignore me for a few months. Then she would come back to me in secret and we would hook up while they were still going out. This was the routine for a few years until he went away for a period. When he came back she saw a change in him and supposedly lost all feeling for him, even though she used to say how muchs he loved him and pictured marrying him. Me and her were very close throughout these 6 years. She always had kept me in secret for some reason and I'm getting sick of it. Her ex got a new girlfriend but yet was still texting her from time to time. Now he called her and confessed his love for her. She was happy he called just so she could feel closure of their relatiionship. She felt wronged by him and claims she has no feelings whatsoever for him. Now, I am uneasy with what's going on and I feel that at any time she might fall back in love with him. I feel like I'm just the secret on the side and I'm sick of it, but yet I can't let her go because I fear loneliness and ii would miss her too much. 6 years is a long time. What should I do?