Our relationships (marriages) can be doomed from the start if the intentions of our heart are not pure and committed to serious covenant. We cannot seriously and sincerely love someone and keep our options open for others. Love is only blind when we ignore the wall of character. Of course when dating online we are trusting that the image people present of themselves is authentic. Other than the exceptions from online dating, we are first attracted to our spouse, then we get to know their character in a deeper way. When we enter a relationship with the wrong intentions, we ignore character with the heart intention to conquer and From there, we begin to build relationship directly with the character of  if the intention of our hearts is not lasting covenant between God, us and the one we say we love, we will continue to make casual commitments that expire when the infatuation wears off.