Every culture has different requirements and it is very difficult to be women alone in a male controlled culture. As CW has noted, the wedding probably passed now. I hope that all went well and that your cousin was no where to be seen.
Probably the best thing to have done would be to go to the future in laws and explain that there was a previous interest which proved unsatisfactory as the man misrepresented himself. Then explain that your cousin has been under a great stress and is not behaving rationally and that he might attempted to bother them with his own misunderstandings and confusion.
Again I hope all has gone well.
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