You often helps him by repainting the bed room (him to begin to sort thru her things with him) and changing furniture around and encouraging. (Better if their in-laws contributed to this, it really is area of the grieving procedure)
Shanhun, i could know how you’re feeling about that relationship and just why you might be wondering whether it offers a lasting future.
But I do not think you’re, at all, wasting your own time using this guy, as you like being with him, you state you like him, and you will also imagine investing the remainder of one’s life with him. So long as the connection has those aspects that are positive and it is satisfying in today’s, simply enjoy being with him.