can a scammer claim I am harassing them if I am trying to recover money they loaned to them through a relationship scam ?

Can be. Ironically, you could actually run afoul of several collections laws in Florida that may apply to you as a "consumer debt creditor". You're best bet is to either file suit and have him prosecuted criminally  for the fraud you claim he did or just let it go and move on. Pissing contests on Facebook are just that, they solve little and simply escalate the emotions for no real purpose. In the future, you should be aware that no one can "guilt you" into anything. That is simply a choice you make, absent having some psychological defect that would render you incompetent. I say this to you as many people make poor decisions in relationships or money issues and attempt to seek solace in claiming victim status. This commonly becomes the focus of diffulty in seeking various remedies if the allegations aren't consistent. More importantly, this often leads to repeat conduct because the bad decision making is never acknowledged or corrected.