I don't know how many bikes you have, or just how "old" they are, but it couldn't hurt to sell some as at least a gesture of good faith now that what's done is done. Don't wait for him to ask you if you'll sell them. Take the initiative and do what's right.
Your husband has been through UNBELIEVABLE awful grief experiences over the past few months. Who could possibly be happygolucky after such horrendous events?
Perhaps you should approach him about riding WITH you as a way for him to begin doing good healthy/healing things for himself and as a way for you both to bond or draw closer together. HE is the one who needs comforting- he must feel as though his whole world is crashing down and nobody thinks about HIM or his needs at all. There are many ways you can help make things right if you are creative and determined.