Hmmm...for my game I am trying to set it up so that you can't really have a tie situation. If that is the case you could choose a favored love interest and start stacking the if, elif statements in a particular way (boyfriend1 romance ending, boyfriend2 romance ending, boyfriend3 romance ending, boyfriend1 friend ending... forever alone ending). I am by no means an advanced ren'py user though so you might wait for somebody more experienced to chime in.
edit: Giving the player a choice is a good option as well depending on how you are setting things up.
Thats ok, youve been really helpful, I think I'll stack the statements once I get my head around what I want to do.