I have had a similar experience in the past… twice. Both times the tenant wanted to leave about 3/4 the way through the second year of their lease. Better to let them out on good terms than have someone pissed at you living in your property.
They are legally liable for the rent while the place remains empty (as long as you advertise and don;t increase the rent).
Or if the market is like it is now, there’s the bonus of increasing the rent for the next tenant.
If I were procrastinator I wouldn’t put off signing that lease.