I think we all occasionally spend money on things that don't always work out, and normal people eat it, learn from it and move on.
He's just trying to make you eat some of his **** sandwich for him.
I frequently get calls from people that tell me they already spent what they can afford with someone else, and want me to straighten out someone elses mess for less.
I just smile and tell them no thank you.
One that really made me laugh was someone calling me and asking if there was anyone cheaper.:D
How do people have the balls for that I'll never understand.
To some people a little money is worth anything, including being an asshole or trashing their own integrity I guess.