I hear many women say they pick the same guy, essentially, over and over. There's obviously something to that and needs to looked at and resolved. Some women pick older guys who need to resolve things with their father or understand why they pick a father figure.
Personally, my ex's are completely different and I think that's because I didn't know what "type" of man I wanted.
I know relationships can turn out the same over and over again if you haven't worked on whatever it is you need to- if you haven't resolved things from the previous relationship or within yourself. It may seem you pick the same guy when it is just the relationship that turns out the same.