If he does come running to you, there is something else you can do but again it will still leave the ball in his court. At the point he is voicing his concerns, you can again offer your perspective and advice but with the caveat that at that point you let him know that it is his choice, that if these are serious concerns, it's on him to deal with it, accept it or leave. help him get to a point where he is thinking and asking himself what is important, what is worth putting up with and at what point it's no longer worth sacrificing his peace and happiness. Try to get him to realize that he is in control of the choice he makes to do what is necessary to make a change in the relationship and/or his life.