There's a line in a song that goes, "shame on YOU if you fool me once, shame on ME if you fool me twice"- of course most of us are familiar of the song Life Goes On by LeeAnn Rimes.
What did the song imply? It's too heavy to handle actually. It's a song of a girl who fall in love for the wrong person but eventually realized the dilemma she's been through.
Unfortunately, not all madly in love individual have the same realization because there are still those who choose to continue to live in stupidity (sorry for the word), those who choose pain over common sense.