So I am starting to see my gf again whom I broke up with about 4 months ago. In our time apart, I got into a relationship with a girl whom I met in my church group. Just to be clear, we met after I had broken up with my gf. Recently, a friend from this group suggested I may have been somewhat dishonest to this other girl and even worse that this lack of honesty could be sin. I was honest to her about having an ex girlfriend, but also said during our relationship that I would not date my ex again. Which when I said it, I really believed I would not. I was simply not counting on my ex changing that. Basically I broke up with her for a specific reason, and by a miracle she really changed. This other girl has quit our church group over this, and seems to be (unfairly?) saying Im partially at fault for it, and is apparently upset because she really believed I had closed the door on my relationship with my gf. Anyway, was I really not completely honest with her and did I sin against her? I know I said one thing and did another, but the point is I didnt mean to. I know I made a mistake and definitely wouldnt have started another relationship had I known my ex was going to change. I feel bad that she now doesnt have a church and doesnt get to see her friends anymore. If I did sin against her, what should I do about it? I wish she would get over it, but she seems to be choosing otherwise or incapable of getting over it.