Feelings

Why do people feel the need to hurt the ones they supposedly love ? Why do they do things behind their partners back ? And then when a person finds out what has happened they feel insecure and wonder what if? How can one NOT expect the other person to feel the way they do when they find these things out. It really makes one stop and think am I really loved? Is there someone else who the other wants to be with besides you? Do they really cherish you? Do they truly want you? If so then why could or would they do the things that they know will hurt you to no ends and why do they keep doing the things that they know is wrong and that it hurts the one they so call love?  How can you trust with all your heart and with no doubts? You can't! Maybe after it happens the first time a person maybe able to trust easier than when it happened over and over again and things are hidden from you and you find out these things are still happening they may not always be in the same format but over all its still the same no matter how you look at it! Makes one wonder and no one can expect otherwise.........