In some ways, it's too easy to fall for someone in SL.
You're together only for short intervals, and on your best behavior. There's no need to worry about bodily sounds, odors, or emissions. One's avatar may take time to rez, but it won't fall ill. Kind of like grandparents, who can visit the grandchildren for short intervals and needn't be around when the diapers need changing or the flu strikes—none of the tests that real love will survive.
OTOH, can't one say that about the initial rounds of dating in RL? Does one's true self eventually show through in SL, just as it does in RL?
I wish I knew, and I wish I felt I could live up to what others think of me.