It's a natural emotion, but make sure you're not letting it affect how you deal with this new GF.
You shouldn't be rude to her or make snarky comments to your friends at lunch.
It will probably make him uncomfortable or look like you're starting drama, both making it unlikely your plan will even work.
Source: Seriously, you will start finding yourself knowing more about their dates than you probably want to know.
When your crush is single, it seems like there are all sorts of possibilities, and once that relationship status changes on Facebook…