Just something to chew on...
Including both the PGA and European Tours, he has amassed something like 23 wins total. Of those 23, only 4 of them happened between December and March.
He's never been much of an early-year stalwart, which (imo) might be part of the reason why he's not managed to don a Green Jacket. And further to that point, I think part of the reason why he's historically been a slow-starter during the early part of the year is because he's not playing all that often from mid-November through the end of January.
I don't think it has an awful lot to do with his love life, but more so that when he shuts it down - he completely shuts it down; unless he's playing for millions in appearance money or a contractual agreement with a title sponsor requires him to be there, of course.