Romantic Subplot suggestions?

I am working on a story and am considering a subplot idea (the story is a fantasy adventure series):

The main protagonist is a young adult woman who encounters and is eventually accompanied by a man who she was originally arranged to be married to, whom she abandoned at the alter (she was 16 at the time, while he was 19). He is not actively angry at her for this (all this happened nearly 3 years ago) but currently has no romantic interest in her and felt humiliated by what she did.

My question is, should I have these two characters eventually get together romantically as the series progresses or should they just remain as fellow adventurers? I can see the pros and cons of both of these options. Any feedback or suggestion would be most appreciated.