What Does It Mean When Something Is 'For Good' or Offered 'On a Plate'?

"'Cause you on my mind, it's got me losing it
"I'm lost, you got me looking for the rest of me,
"Got the best of me, so now I'm losing it
"Just your presence and I second guess my sanity

"My tummy's up in knots so when I see you I get so hot
"My common sense is out the door, can't seem to find the lock
"Take on me (uh huh) you know inside you feel it right
"Take me on, I could just die up in your arms tonight.
"I'm out with you, you got me head over heels
"Boy you keep me hanging on the way you make me feel

"It's not healthy... for me to feel this way"