They married young, straight out of college and were incredibly happy for a while, but shes always been confused about her sexuality and having met her potential soul mate so young, never got the chance to experiment. Skip forward a few years later and shes fallen head over heels in love with another woman, leaving him heartbroken and their marriage in tatters, but eventually everyone has to move on and he begins dating again. A few months later, when hes had time to lick his wounds and the shine of her whirlwind romance had gone, they bump in to each other and strike up a friendship again.
I'd love to play the guy for this line using Jason Schwartzman as a PB, loads of different avenues we can take this down.