Technically if you only broke up a couple of days ago she isn't really an ex. Thats more of a comma than a full stop.
And going back means it's not over so there is no point kidding yourself that just cos you said its over that it is.

When you say its over and you let it go...Then it's over.
At the moment your still playing the game.maybe game isn't the right word...I probably need a thesaurus.

Riding the swell?
Eugh I hate it when I know what I mean but can't spit it out.

Be careful man, take care.