A little hasty. Remember you're already unpopular with the religious community for your murder of Comyn. This won't convince anyone you're a good Christian king.
You have no quibble with Edward II. Rumour has it he's a bit of a push-over. You attempt to strike an alliance with him. This would be a peaceful end to the tyranny and bloodshed that has torn Scotland apart for years.
With Edward II's withdrawal, you should make the most of this opportunity. There is plenty of land still to cover.
Which card will you play?