I'm going to confront my friends crush
Why do you have to confront them?
I think it's because I was left out of things
It sucks that you have been excluded like this sometimes, but you have to respect your friend and their crush. This is a major life event for them and they are just focusing a little more on it. You should keep out and not shun their experience, just support them.
I don't understand. Why can't I just talk to them?
Even if you just want to talk to them, it can mean meddling on their side of it all. Be aware that if the tables were turned would you like this done to you? I think you should just let them have their relationship to themselves.