Re: How should I react to this by girl I am non-exclusive with
You said it isn't exclusive so she is free to see other ppl and so are you. Don't make big deal of it. You can see or sleep with others too. I don't see what the issue is here. If she wanted to see you and you had some other chick you had plans with already you would turn her down so, just don't get all jealous about it, doings so will just insure you don't get anything or worse end it all completely. Just move her lower onYour priority list.
Learn to be a better person not a better player.