Sentence 1: Alex has been in love with a girl for years. 
 Sentence 3: After realizing what he lost, he tried to find her 
 Sentence 4:  He asked around, but he found out she moved away 
 Sentence 5:  Alex became heartbroken for messing it up 
 Option 1: He proposed to her not that long ago. 
 Option 2: He broke her heart not that long ago.