One Tenant Moving Out

[Kurt H.]

I have a couple renting a place in a transitional neighborhood.  Due to Covid they paid half rent for three months and deferred the other half so there is ~$1100 in backrent they've been making $50/mo payments towards. I was just informed the girl is moving out and the guy wants to know how to take her off the lease.  They've been good tenants but I'm concerned about his ability to pay the full rent considering they've seem to be stretching to pay it every month as it is.  Do I ask both to move out and deal with the flip or see how it goes?  They are month to month at the moment.