Anecdotally, my ex-girlfriend started taking the pill around the start of the two years we dated (to regulate her cycle, not because we started dating, though i

Anecdotally, my ex-girlfriend started taking the pill around the start of the two years we dated (to regulate her cycle, not because we started dating, though it was...convenient). She's off it now, and looking back on it, she thinks that the effect it had on her mood/personality contributed to our breakup (we're still friends, in case that's not obvious, and have discussed this).