re: I am sad that he would rather just walk away then put effort into making things work.
....exactly how would you 'work on it'? What methods, techiques, attitudes, style, etc. are you going to use to 'work on it'? Do you even know how to work on it? Are you willing to LEARN HOW to work on it?
If you have to move on to another bf, will you know how to work on that relationship?
In exact, specific terms, what does it take to 'work on' a relationship?
Since you have the option of adding details to your post, I'd like to see some examples of exactly how you would work on a relationship.