Has your partner ceased all contact with you? If not, then you may find out from him, later, why this happened. I replied on your earlier thread by saying that 4 years is around the time that relationships stall and I think it is relevant. With 50 miles between you it is much easier for him to take a step back when he feels the need than if he were living with you. It may help you to read a self-help book. I recommend "Staying Sane" by Raj Persaud. His knowledge on personal relationships is really interesting and there is a lot of good advice there. Once you understand the process you are going through you can keep moving ahead. Please don't lock yourself in the grief - you can find the strength.