Why would my friend settle down and with a chubby girl when he could sleep with any woman he wants?

I have a friend of almost 14 years that has slept with many different women in his lifetime getting to the point where he would even pull multiple women in a day. I was really disappointed to hear that he was settling down with a chubby white girl I knew in high school. He's easily slept with over 150 different women going on trips to different countries and meeting women. Is there something wrong with him or what?
Why would my friend settle down and with a chubby girl when he could sleep with any woman he wants?
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