The most recent information - January of this year - says that they are still dating. There has certainly been no news of a break up and they are still working together, so you can guess that if they had split up it would have been mentioned somewhere.
Alex Ebert met Jade Castrinos outside a cafe. They started a relationship and later formed Edward Sharpe and the Magnetic Zeros. They wrote music together and became a part of the art and music collective The Masses which was partially funded by Heath Ledger. At one point there were more than 10 members in the group. There have been no media reports of a break up.