Unfortunately those would be the only options that exist for returning:
1. Canadian visitor
2. Student visa
3. Work visas or employment green card ( H visa, L visa, TN)- but these require job offers
Otherwise, once he gets divorced, you and him can also get married and you can begin the spousal visa petition for him.
I'm sorry, I wish there was another option but I do not make the law. I can only explain it to you the way it stands. I hope you understand this. If you need any other clarification please let me know. Otherwise I hope I have earned your positive rating.
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