Why does this guy continually go from short relationship to relationship always coming back to me?

He tells me he loves me and always will. He never stays out of my life for long. I'm definitely done forgiving him and taking him back but im just so curious. He always turns into a jerking and blames me for everything under the sun then leaves me for some girl he's had lined up beforehand. The girl is usually half his age, a total mess and dependant on him. However he tells me that I'm the best lover he's ever had and can't live a life without me in it. It's all so sickening. What's with this guy. He's almost 40. I'm positive he's a narcissist. Ugh...
Why does this guy continually go from short relationship to relationship always coming back to me?
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