I was in relationship with girl few months ago. Later I discovered that she was just doing tp with me. Actually I loved her very much. But she cheated so I left her. Actually when I dream of sex with my imaginary wife or ex gf I get excited and penis gets erected. But some days ago ex gf came close to me suddenly in CLG campus on the stairs, nobody was there we kissed and foreplay moves. But my penis did not get erected that time. May be I was thinking that somebody will look. But we both wanted to have romance. What will be the reason of this? When I will be getting married in future and gonna have sex with my wife what will happen. Can I have great sex with her? Please assist.