What state do you live in? You think that you're not married. The law may say so otherwise. Let see now, you own a house, together, on paper? Are there congugal sleeping arrangements? If the answer is yes. You should check the local laws.
That may be marital property.
If it is, sounds like you need to get another partner. Unfortunately, it is a bad time to sell a house.
Good luck on hanging on to the bikes.