I watched a WWE video and loved this song. Link to when the song starts. I believe it's a popular song. What is it?
The tune and the lyrics ("I'm so in love with you") are a match right at the start of the song itself.
I found it by using Shazam repeatedly—it identifies the song by Seether mentioned in @Stormblessed's answer and another called "So in Love" by King Bass, but searching on YouTube for the latter brings up the song by SirensCeol as the top hit, which actually turns out to be what you want.