For me, the fun went out of flying when I left the military.
And now, the fatigue, the constant pressure of management decisions, the perpetual adjustment of rosters,the constant re-writng and inventing of SOPS and manuals and attacks on our terms and conditions, especially in the area of FTLs have made the job a chore which quite frankly I would not be upset if I had to stop tomorrow. (Apart from the cash that is!)
Not burnout, just fatigue and tedium.
My advice, go and get a hobby removed from flying and leave the job behind you when you leave the airport. Sailing works for me.