Lyric discussion by phonograph 

Cover art for Hindsight lyrics by Long Winters, The

yes, I agree. and i believe the hard thing is for her to commit to him or to be willing to enter the relationship. he's saying that she knows "we're a good thing" and that she's going to regret it if she decides not to be with him, which is what she knows is right but she is afraid of at the same time.