This isn't a Sublime Text issue, it's just how HTML works.
The line breaks in HTML count as spaces. Browsers will collapse multiple white space characters down to one character, which is why you will always get exactly one space between the text like this
T e s t when you write:
in your HTML.
So I can assure you, that if you do this in any other editor, you will get the same result.
The solution is to not write things over multiple lines if you don't want a space between them.