Seller constantly wants out

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Our closing is due to be in June this year. State is Florida
We do not wish to release the sellers from this contract if we can help it.
If we've done everything we were supposed to do that is stated in the contract. The sellers had decided to go through Buyowner in order to sell their home.
For some reason or another, the sellers had been coming up with different reasons for not wanting to sell us the house. Each time they had wanted out of the contract had nothing to do with anything we had or had not done. One week everything was fine, good to go, the next I was sitting on pins and needles. In fact, it had gotten to a point where I had been able to relax once again because I was reassured that the house was ours and everything was going through. Then we get the latest phone call. You got it, can we please release them from the contract once again. Each time the seller calls, there is a new excuse.
Can they keep doing this to us? I feel like I'm being harassed in a way. What if they turn around and sell the house "if" we release them from the contract? Is it possible for me to write up a release of contract with a clause in it stating that I will release only if they are not selling the home or that if they do decide to sell in the near future (within a certain amount of time) that we get the home?

I'm so lost, so confused. This was a dream come true for my family.
Thank you for your help in advance

[HomeGuru]

Both parties do not have a clue. Hire an attorney to review your contract and advise you accordingly.