He didn't look happy to me last season. There seemed to be some frustration bubbling under the surface. I expect that playing second fiddle to Rogers' rise and improved contract (not to mention Asensio, Rashford) has put his nose out of joint.
I don't think you could blame him if that is the case. Equally, you can understand why the club would be unwilling, at his age, to bracket him towards the top of the salary scale when he has still to show his worth on the pitch, week in and week out - especially with SCR rules.
I wish him luck, in any event. He's a thoroughly modern player, shame he couldn't achieve that potential in claret and blue.