My interpretation is that its about this relationship that has been kind of rocky. Maybe they've been fighting a lot (It's hard to take the blame [for the fight maybe]) and she's been thinking of just giving up, but then she realizes that maybe the relationship is worth a lot more in the end and so she decides that it's ok that they've "slipped up" and fought a little bit and that she will just keep the fight to herself and continue the relationship.
My interpretation is that its about this relationship that has been kind of rocky. Maybe they've been fighting a lot (It's hard to take the blame [for the fight maybe]) and she's been thinking of just giving up, but then she realizes that maybe the relationship is worth a lot more in the end and so she decides that it's ok that they've "slipped up" and fought a little bit and that she will just keep the fight to herself and continue the relationship.