The means whatever your experience is with love. What you bring to the song in your heart is how you'll feel it. For me, I was engaged and ready to give a woman my heart for every. That was a big deal for me. But she got scared and went back to her abusive ex. Sooner or later. . Means not to take anything for granted because anything can change when you least expect it.
That's the meaning I bring to the song.