To tell you honestly you situation just happened to me last year.. my bf and i broke up.. i was the one who broke up with him.. though that time he had a gf after our break up.. he didnt give up to show and tell me how much he loves me.. for seven months of doing that.. he mad me fall in love with him again.. maybe because of the effort that he made.. i think best advise will be dont ever give up if you really love her show it to her and try to have a small competition between you and the other guy.. that will be the sign that you still want her back.... goodluck.. trust me it will happen..