What could this mean? any advice?

so pretty much i went out wit a girl for 3months and its been 2months since we broke up and i cant move on and i still rlly love her. and just seeing that she has already moved on makes me sad bcuz it seems like she nvr rlly loved me in the first place =/ but the point is that i dnt see guys the same nymore n i've only gone out with 2 but the relationships didnt rlly last long bcuz it was so werid for me to be with a guy now. what could this mean? i still think guys r cute n im kinda attracted to them still but i dnt think i could go out wit one.