If there isn't anybody in the wings and you don't want to leave your woman just keep talking about things. This doesn't sound like a situation where things need to be rushed at all. Ask her what she is comfortable with, that's a good place to start. Who knows, for the time being that might just be flirting and meeting people as friends. The thing is once she knows that she can trust you to respect where she is coming from and what she is comfortable with the comfort level will likely change to include more things and closer relationships. This is a journey that can take some time...in my case about 5 years, to get to the point of really living poly. Good luck to you.
Everything will be ok in the end. If it's not ok it's not the end.