Meaning of "Ivy" ?

[ayu-michan]

I think this is a great song, and the lyrics are great too! The one thing I dont understand is the line where she said "This publicized love with you fills my heart"
it sounds a bit weird with the publicized.
what do you guys think about this song? as in, what do you think it is about to you? to me it's pretty obvious at the few first chorus and stuff, but in the end it doesnt even make sense who she's giving the song to ;__;