OK, OP!
You said he's evasive - He's a coward; afraid of co frontation. He didn't want to run the risk of losing his 'leg over', 'neighbour with nipples' before he put his house up for sale. That's how he's treated you. He's wanted to have his cake and keep eating it for as long as he possibly could.
I doubt he has financial problems. Again, he has a problem with telling the truth. Gaslighters normally also have disassociative behaviours and borderline personality disorders - This in turn makes them compulsive, pathological liar.
He has treated you with indifference and no respect what-so-ever, in not telling you. He's wanted to keep the peace for his own convenience.
Now you need to treat him with indifference. Do not react, or speak with him again. Wave to him like a friendly neighbour and carry on with your day.
If you have the chance - Hide fresh fish around and in his property. The smell is hideous. Hide it under a carpet and place it inside curtain poles, pipes etc. (Childish, but so satisfying).
Book a load of false viewings.
Get yourself an escort/one night stand and snog their face off outside of your house, where he can see you, and leave your window open while you have wild and loud sex.
Forgot to add** Be a noisy neighbour. Next time there's a viewing - You open your windows and blast some metal music. Blast some songs about support for Trump, put posters of Trump up in your windows, on your door, decorate your garden with garish American flags, put flashy lights for Christmas and Halloween together, get a 12ft inflatable Santa...ah, I wish I was his neighbour. I'd have so much petulant fun. 😈😈😈😈😈😈