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Let’s review the bidding. He violated his word and your friendship, took advantage of your trust and avoided the issue for five years. It still sticks in your craw. He failed to offer an explanation or apology when he did call you. You still don’t know why he contacted you.
Why on earth would you think the friendship is worth renewing? Why on earth would you want to renew it?
Even if he did patch things up for a bit, the other shoe would drop. He would have another nifty business opportunity for you, or he would want to come stay with you for an indeterminate length of time while he was in your town on business. Or who knows what. And eventually you would be left holding the short end of the stick again.
If he sends you $700 cash the check. Do not expect to hear from him again, let alone get an apology or explanation. Do not initiate any further contact. Check or not, chalk it off to Lessons In Life 101 and be glad you got off as easy as you did.