What's up with the Love Song during Ken's flashback over Ryu

I agree. In the japanese version the score creates an overall unfitting mood, which goes from cheesy to hilarious. and yes, now as you say it, the "heart warming" melody really does make the scene appear a bit gay.
but this is also due to a general tendency in japanese media. they are more... open. in the sf2 v series there is one scene, where ryu and ken are swimming alone in a pool in a penthouse. and while ryu is in the water, ken is standing at the side, getting fully naked, posing for a second (with front to ryu), just to jump right upon ryu...
completely gay.
and in another scene, while they spar a bit for fun, the training turns to ground fighting. then, out of a sudden, ken grabs ryu's pants and pulls it down, exposing ryu's underwear. the scene fades away then, and you hear them laughing and stuff.
hahaha!!!

My thoughts EXACTLY . And I've stated this many times on this board . The Japanese version is just way too pop-ish for Street Fighter .

There's more in the movie that hints at a gay relationship between ryu and ken. When Ken is talking to his girlfriend about marriage (which comes up totally out of the blue), and she says no, he has a flashback of Ken saving his life when he nearly falls from a cliff. When he drops his girlfriend off, he says something like: Ryu, I'm tired of waiting.

Gosh guys...they're just good, longtime friends. Bro's before Ho's.