Lyric discussion by underalocomotive 

Cover art for Along The Way lyrics by Honorary Title, The

Seems like the narrator cheated on his girlfriend and is sorta explaining his reasoning behind that. He is being honest about it because he knows that it will come back to her eventually.

He of course feels guilty and regretful and is letting her know it was a mistake, it meant nothing and he will never do it again.

[a lot of times we are stupid and we do stupid things and after the fact we are like 'what the f* was i thinking?' Then we promise ourselves we will never do it again because we have learned our lesson- this is what the song is about i think]