Bluntly, for a user of a site like this in 2017 there is simply no excuse for sharing passwords. In ops we used to say "If it's not backed up, it doesn't exist" - and I think a modern corollary could be "if your password isn't unique per site, then no, it's not safe". If you reuse passwords, your security is only as good as the weakest site you used it on, and you are playing with fire.

Just go and buy 1password (or similar) and use it.