I think it's only true if you believe in it
You will know when love comes when maybe your friend start to talk nervously or act differently around you. Or maybe when they start blushing. Love is a relationship you have with other people who you can trust and care for in my opinion, and maybe when that person or you can't live without each other. ;)
no, love tends to be full of deceits and half truths...it starts with your parents (oh I have never did drugs) and ends up that way with your spouse. Relationships take a lot of care to maintain.. the truth, is like a sledgehammer to a relationship.
If it's "Real Love", you will have a peace of "Mind"! You want be worrying if they are cheating or doing anything else that would hinder your "Love" for one another.
Real love is true because it only knows how to love.