I feel guilty about something that I did tonight.

My opinion is you should have stayed out of it.
Now it`s dirty money, and you`ve heard of karma.
We don`t know this guys situation.
Back in my 20s my niave stupid EX wife fell sucker to a crack head bit**.
Probably gave her a sob story, so called new friend had toddlers and a worthless crackhead husband.
To shorten it up, my ex stopped paying my bills, she took care of all my finances. I did`nt have a clue untill they came after my first new vehicle, a little nissan truck.
This was the most heartwrenching time in my life, and I had 2 little ones to take care of too.
Morel? stay out of it unless you really know the people involved.
Give the money to a charity.