Lost and hurt; need advice badly
I got married at a very young age to the man of my dreams after knowing him for about a year. He treats me like a princess and tells me everyday how much he loves me.
I'm very submissive in this relationship and let him call the shots, just like he wants it. He is a very dominant and controlling guy. During these nearly 4 years of marriage he has cheated on me 3 times that I know of. The first 2 times I did forgive him, even though it hurt like hell. The 3rd time happened quite recently and I just don't know what to do anymore.
He keeps insisting that it's only sex and that he truly loves me and wouldn't be able to live without me by his side. Sure, he has an enormous appetite for sex and sometimes I just can't keep up with it, if you know what I mean. But he knows how much it hurts me and still does it. This time he swears that it will never happen again and begs me not to leave.
I'm lost and hurt and don't have a clue what to do... Please, give me some advice.