Missing space when newline is used + other issues

This is some text with some linebreaks\\ Note that the
two backslashes are only recognized at the end of a line\\
or followed by\\ a whitespace \\this happens without it.

This is some text with some linebreaks
Note that thetwo backslashes are only recognized at the end of a line~\~\

or followed by
a whitespace ~\~\this happens without it.