Sentence 1: Tom used to a very jovial person. 
 Sentence 3: Now he's much less gregarious 
 Sentence 4:  He still says he's looking for love 
 Sentence 5:  But we all think Tom's learned his lesson 
 Option 1: When the girl he wanted to meet stood him up that changed. 
 Option 2: Then one day he fell madly in love with a girl.