I believe the punctuation you intended was the em-dash—so called because it is the width of an "m" in typical typography—which acts as a kind of weaker replacem

I believe the punctuation you intended was the em-dash—so called because it is the width of an "m" in typical typography—which acts as a kind of weaker replacement for semicolon or parentheses. You can type it with option+[-] on an Apple device. If you can't or don't know how to type the character on the device you're using, a pair of hyphens are conventionally understood to represent the em-dash, as "--". No spaces are required on either side of this mark in any case, though if you choose to use a single hyphen to represent it then including spaces would certainly be better (clearer) than not including them.