You can sell but he can seek a court order to stop you.
Because it is a long relationship he would be entitled to a share.
You should seek to get orders and finalise the property between you.
The law will apply the following steps
Step 1: Determine what the assets are and their value
This will include all assets and their value as at the day that you are dividing them. It does not matter whose name the assets are in, they will form part of the matrimonial pool. Superannuation entitlements are also included.
Step 2: Determine what contributions you and your Husband made towards the assets.
This includes a consideration of both financial and non-financial contributions. Consideration is given to what assets each of you brought into the marriage as well. The weight given to your initial contribution will be dependent upon the length of your relationship. The longer the relationship the less weight given to the initial contribution.
Step 3: What are each of your future needs.
Consideration is given to your respective ages, your comparitive income earning capacity as well as other factors.
IF these things don't balance equally for each spouse, then an adjustment is made in the percentages.
Step 4: Make an order that is just and equitable between both spouses
So he is entitled to a share.
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