The fact that the person that owns the telegram now sent messages to people I had conversations with it's not my problem.
whose problem then?
Yes, I have accepted to give him the money he lost, but after series of pm's and his arrogance, I decided not to care anymore.
it does not make sense, you knew you it was your mistake that's why you decided to pay him. so him being nice to you or not should make no difference, admiring to your mistake once, doesn't give you the right to change your mind the next day and say it was not my mistake and i am not paying you shit.
No, using a single address it's a stupid way to manage cryptocurrencies received from severals users.
The opposite is correct, if you know how to handle your business then you should know that every account you have including bitcointalk are hackable, the only thing that is supposedly secured is your wallet, even if your account is hacked, any btc sent would still be safe, you can have more than 1 address, it does not matter, as long as the user can verify the signature and know it's your own address that should be good enough.