I like to write with people I have a relationship with; otherwise it's kind of scary, and you hold back because you don't want to pour your guts out to someone you never met.
Falling in love is awesome, but I'm never drawn to happy songs per se, so whenever you sit down to write a heartbreak song and you're happily in love, it's like, 'OK, now I have to go back to a sad place to get something good.'