He does not know which one to marry.

So as a test, he gives each of them $5000 to see how they spend it.

The first Girlfriend gives herself a complete makeover, a new hair style, personal trainer, diet, and a whole new wardrobe on top.
When he asked why she did this, she said "i wanted to make myself good looking for you because i love yuo so much."

The second girlfrien bought him a bunch of gifts, a diamond encrusted Rolex, new sets of golf clubs and a new fancy suits.
When he asked why she did this, she said "i buoght these gift for you because i love you so much"

The third girlfriend took the mobney and invested it in the stock market. She doubled her investment, then gave back the $5000 to his boyfriend, then reinvested the rest.
When he asked why she did this, she said "I'm investing this money for our future because i love you so much"

The man tought long and hard about how each girlfriend spent the money and after very careful consideration,

He married the one with the biggest chest