According to Men's Health, a guy who talks alot about himself will leave you feeling lonely and alone. They listed these behaviors of a man who thinks too highly of himself:

• Brags about past conquests in front of you and your freinds
• Waits until the last minute to ask you out, assuming you don't have plans
• Is convinced he knows more about you and your anatomy/job/family than you do
• Never admits he's wrong. 
• Always "lets you win" at pool, video games, ect. . .
• Wears sweatpants on a date
• Calls the waitress "honey"
• Calls you "babe" on your first date