This is a passage from the song Hero by Enrique Iglesias:
Would you swear, that you'll always be mine?
Or would you lie? Would you run and hide?
Am I in too deep? Have I lost my mind?
I don't care you're here, tonight
This is the fourth paragragh and in the third line "Am I in too deep? Have I lost my mind?" What does deep mean here? I looked up OALD and it seems like definitions #10,11 and 14 are all closely related, but I'm unsure which meaning is most appropriate or does it mean something else that's not included in this dictionary?