I am 22 years old and was in a relationship with a girl for the past five years. She is 21 now. Everything was going great and we were planning ahead. I had full confidence that after three years of a long-distance relationship and two years of living in, nothing could separate us. The girl felt the same. I trusted her and never restricted her friendships, even allowing her to have sexual relations with others as long as she knew she loved me. I am doing engineering and also started working to support our expenses. I couldn't give her enough time, so she started talking with her classmate over the phone, sometimes spending four to five hours chatting with him. One day she mentioned at 1 am that she wanted to go meet him. I tried to keep her from doing so indirectly but finally dropped her off to his house. She came back at 5 am. She maintained that nothing had happened when I asked her jokingly about it. A couple of days later, she confessed that she had gone out with him. I was shocked. I had never interfered with her decisions, so what was the need to lie to me? Later when I asked her about us, she said she didn't want to make hasty decisions. Now she is saying that she will not enter any relationship, nor will she keep this one as she is not prepared for it. I can never love another girl again. I love her still and don't know what went wrong.