IME, no need to reject or to flex nuts. If you are honestly bothered by this, ask yourself why? However it sounds like you are not since you went on with your life, and she went on with hers.
There's a separate thread about a girl not hitting up a guy on
text right now. Some responders think this is their game. They probably just have lives. Which is what 90% of game or text game is trying to mimic. Whether their lives involve other guys is irrelevant. You two had sex, she went away for a while. IMO it's not worth reading too much into it. Just enjoy things as they are.
As for what to do next, I agree with
@EyeBRollin , invite for dinner at your place. Or maybe just wine and a flick. Keep it simple.