I also second what above posted. IF you are married you are married, untill decided by the court.
Proof has to be provided.
Else their is Non-Accompanying Spouse, but, like mentioned above. The Guide says;
All applicants must undergo a medical examination.
You and your family members, whether they will be accompanying you or not, must undergo and pass a medical examination. (Page 40)....
The Guide also mentions that they have to Fill the Schedule 1 Background Declaration form and Additional Family Form;
your spouse or common-law partner (whether accompanying you to Canada or not);
your spouse or common-law partner (whether accompanying you to Canada or not) (Page 26)....and (Page 31)..
If you are in stale relationship, and make the points. You can file for a divorce, but, we can just suggest only, without considering real life implication, practicality of the decision has to be made by you and your family.
So like they say easier said than done.
Time is short if you want to apply, as after June 30th, there may be or may be not many changes to the Immigration process.
Best of Luck