relationships
habit - it's comfortable so why leave it, you know them and they know you, sure it doesn't have any spark, but it's comfortable
pity - your with them because you feel sorry for them, if you left them they wouldn't have anyone (ya ain doin em any favours here)
fall in - they were there and you were there what's to figger
friendship - we share the same intrests and have so much in common
TRUE friendship - your happy when they're happy, your sad when they're sad, you keep getting little things for them just cos, you respect them and they respect you, (remember the respect thing it comes in later), you put them ahead of yourself and they do the same, THEY TREAT YOU WELL (get the picture)