The word was originally lover but I didn't like that. While running the risk of sounding something - not quite sure what, romantic? Young? Once-idealistic? - he and I were many things to each other over a long period of time, but most of those things were never labelled. I was going to say "defined," but then - rhyme.
I haven't the slightest clue what the word lover means. I remember getting a Valentine's Day card from a sort-of girlfriend once -- I was like 15, we didn't do much more than make out, surely -- where she had found a 'friendship' card, crossed out 'friend' and written 'lover' instead. I was like, we are? Are we? What's that mean? Was confused and worried for ten seconds and then went back to video games or whatever 15 year olds do. Anyway. Manboy was a fun choice.