Okay, the tongan wasn't because of a girl- it was a church thing. I was living in Mt. Druitt, which is 99.95% tongan, samoan, and cooka islanders. Mostly tongan and samoan. No white people around at all.
Anyway, I started learning tongan and samoan so I could talk to people- a lot of them would play off like they didn't speak english, and some of them really didn't speak it at all. So I picked up a couple of languages, and haven't really used them at all since.
No, but I did have a girl give me a tagalog book- when I asked her why I would need to know tagalog, she told me "So you can talk to your in-laws!"
And I suddenly realized what it was she was saying.
-kv