I still think this song covers their relationship all the best, it is also one of the best edits (and I have seen them all ;) It was made for S1 but the song covers all their story perfectly, even though it is not part of any soundtrack (the S3 soundtrack is not so good, actually). I absolutely love this song and regard it the best Wille and Simme's song.
No, in public interviews, they make it clear that working together has brought them close as friends, but nothing more than that. It’s hard to believe because their chemistry is so amazing , but that happens with a lot of actors. They look good together, but they’re not really together.