Serves him right. He has no morals. No class. No ethics. He spent a full election season saying he was a "Never trump guy". So when trump called him up and said "You wanna be VP?" the respectable thing would have been to say "Yes, but not with you. I'm a never trump guy".
He didn't do that. He said "YES SIR!!! WHERE ON YOUR ASS WOULD YOU LIKE ME TO KISS, SIR???"
And this is where he is today.