one more question though, when we get married, we apply for sponsorship, and that's 6mths-1yr, can i live there for that time, or do i wait to hear back?
You can't
live in Canada during that time, but you can usually get permission to
visit for the entire duration of the application. You still have to show that you haven't moved in yet and intend to return to the U.S. They will usually give you 6 months at first, but if everything is going well with application the first extension might be for 12 months rather than 6 months. If necessary an additional extension can be added. If you do need to return to the U.S. during this "visit" period, you have to justify everything again when you come back and it helpful if you have your partner/spouse with you when you re-enter Canada. You can't work as a visitor.
something had happened that i had to leave Canada b4 i got a reply, can that effect anything?
I'm not sure about this. As an American, if you are back in Canada now, they probably haven't really noticed. If you are still in the States, I'm not sure what will happen. I suspect that you're probably going to have to request a whole new visitor record at the border. Actually, you don't "request" it, they decide if they want to give you one. They also decide if you're going to be allowed to visit at all. Just make sure you don't lie. If they find you being dishonest, you can be denied any entry into Canada for a year or even longer.