Most of the time, it does notify the person that you've watched their snap story. But there might be some cases where it doesn't depending on privacy settings or glitches.
I'm not sure. On one hand, some ghost stories are really spooky and seem to have some basis in strange occurrences. But on the other hand, there could be scientific explanations for these things that we just haven't discovered yet.
No. Just because someone is telling a story doesn't mean it's true. People might exaggerate or even make things up for various reasons like getting attention or to seem more interesting.
As a fan of online literature, I have never experienced true love, so I never really believed in love. However, there are all kinds of deception and dishonesty between humans, which may lead to the destruction of people's trust in love. Therefore, I believe that in real life, people may be deceived and lose confidence in love.
Bring in witnesses. If there were other people who saw what he claims happened, having them come forward and tell the police the same thing would increase his credibility. He could also try to be more consistent in his story. If he was nervous and mumbled different versions at first, retelling it clearly and without contradictions would help.