Stuck on you

I have a coworker who's originally from Romania, and she's trying to increase her vocabulary and exposure to American / English words and phrases. I've explained ti to her as best I can. but can someone give me a decent definition of "stuck on you"? Everything I see on the web points me to Lionel Richie.

The phrase means that you are attached to someone emotionally, possibly in love with that person.
Happy Valentine's Day.

As sung by Elvis:

...I'm gonna stick like glue,
Stick because I'm
Stuck on you...

Not that a dyed in the wool rocker like me would know...but "Stuck on you" was a bigger hit for Lionel Ritchie...or so I've been told by the sort of person that would listen to anything other than METAL.

WH