Ok, so personally I think marriage is pointless. I've been engaged twice and never made it down the aisle. All that changes is your last name and you're stuck with a dress that you are only going to wear once in your lifetime. Am I right?
Just because something doesn't work out for you doesn't mean it doesn't work out for someone else. Maybe say ''no, thank you'' the next time someone proposes or don't make the proposal yourself for whichever happened.