Although it's human nature to want to give people the benefit of the doubt, this is not behavior that ever turns around for the better.

Give you the wherewithal to pursue and achieve your long-term goalsMany investors start off "too hot", and they either overdevelop their first property or they spend their money too fast - either of these behavior will stop you dead in your tracks, and you probably won't even be able to achieve your short-term goals - and you certainly won't have the resources to pursue your long-term goals.

This leads untrained and unprofessional people lying directly to sellers not taking into account they are messing with peoples lives......they are basing their whole business model on unethical behavior.

Because when it comes to the dollar and greed sets in there is no such thing as ethical behavior.

I'm confused about his strange behavior, but I'm also glad to let him go and I hope his buyers find a way to let him go.

You have to have a persistent behavior like a detective at times to get a hold of these people. the best advice I will preach is ,show empathy and understanding of their problems, not greed!!

Within 6 days of sending a fully ratified purchase contract to your lender (3 days if you consent to electronic receipt of disclosures), you should receive this document from your lender.In the upper right corner, it has a "rate lock" portion that is legally binding.Hardcore rate shopping at the preapproval stage, and/or when you're just on the phone, encourages dishonest behavior, because folks will quote unrealistically low to keep you on the phone, as OP just learned. 

I can understand his concern over a significant rent increase, especially unexpectedly, but it doesn't justify rude or aggressive behavior. 

If you want them out no matter what, then don't renew the lease.If you're ok with them continuing their behavior (because they will), then increase the rent.

Yes, it sucks to pay off a PIA ex and reward her bad behavior, but in the end it may be the cheapest, fastest route.