sounds as if the speaker's having issues -- perhaps all made up inside his head -- in a relationship.
he feels burdened, it seems.
he knows this. he can feel it.
his girl is probably getting sick of his indecision.
hence the "I've never been so wrong to think you'd just come running back to me."
perhaps she came back many times before.
but, enough's enough.
he just can't get his head to be with his heart, which is wanting to be with the girl.
sounds as if the speaker's having issues -- perhaps all made up inside his head -- in a relationship. he feels burdened, it seems. he knows this. he can feel it. his girl is probably getting sick of his indecision. hence the "I've never been so wrong to think you'd just come running back to me." perhaps she came back many times before. but, enough's enough. he just can't get his head to be with his heart, which is wanting to be with the girl.
maybe? :)