<human>: Can you condense the text into a few key points?

Hi Everyone! 

This may not be the place to ask. My live in boyfriend and I are parting ways. We live in an apartment in NYC. We're both on the lease with our parents as guarantors. Our lease ends in November. 

I'm moving out. We're planning not to break the lease.  I've found a room in another apartment where I'll be subleasing month to month. 

However my ex and I are working out an agreement for me to help him with rent for the rest of our lease.  

What is the best way to organize this and have it well documented to avoid any shenanigans going forward?
<bot>: broke up with BF. Still on a lease. Still contributing a small portion of rent. What's the best way to document it and avoid shenanigans?