The song is over 2 Iovers that don't see each other because they are many kiiometers away from each other (on the other side of sun).
So the singer from the I perspective Iove the person on the other side of sun becouse she understand him and they think they are for together.
So they wait for each other, but the waiting makes him iii, so he need 37 Stitches to keep the pain, because they wait sooo Iong.
I hope I transiate it good, sorry mes german so my engish ishnt good, but I hope you understand.