This is not normal behavior, but I see it more and more in our society. Girls are not taught love of themselves nor have self-esteem. Many of us are left to fend for ourselves at an early age when we should have a lot of love and nurturing in our lives. I feel that you were really neglected during your young years and this man came along and gave you some attention. You mistook it for a true love.
Love is a verb and a word of action.
When someone loves you they do not have to tell you, but they show it in numerous ways. Sex is not love and when two people have good sex together it does not make for a loving, caring relationship. I feel that you are addicted to this man and that is the reason that you cannot leave him. Or maybe you feel helpless as far as leaving and being able to support your children. There are many agencies and churches that are in tune to these problems that you can turn to if there is no close family.