X-23 wrote "Give her space", is bullshit. That's the absolute worst thing you can do right now. You give her space and before you know it, you find out she's cheating on you, and you'll be devastated.

I'm going to be honest, with the way you're describing her recent actions, there's already another guy. The best thing you can do is man up, tell her how you feel, and end it. You'll recover faster doing this, I promise you. Staying in a soon to be shit show like this will only hurt you more, you'll basically be torutring yourself.

Don't stay with her because you feel "she's the one" or "there's no one like her". You're damn right there's no one like her, in fact, there are thousands that are better.

I agree with this 100%
I don't know why you're getting a lot of downvotes..
after being in several relationships, I can honestly confirm this.

Sure, not every girl is cheating or talking to someone else when they say that,
but "give me space" is THE biggest bullsh*t
She either lost interest, wants to be single and have freedom again, thinks there's someone better, or did something..
She isn't being straight up and doesn't wanna hurt you.

If someone really loves you, they never ask for space
Communication is key
you gotta tell her how you feel..
If she keeps giving you bs, move on.

I think your best bet is to ask her to go out for coffee(better in a public place) and talk about what is going on between you to. It sounds like something negative might've happened recently that she is acting out about. She either is acting like this for attention from you or something is really wrong and she isn't enjoying herself in the relationship. I would try and think if you did anything that could have upset her. Possible canceling plans with her to hangout with other friends or maybe talking to another girl? If you can't think of anything that might have upset her then it could possibly be that she doesn't want to be in a relationship anymore and she wants to break up or maybe take a break.

So you have figure out which of the 2 of those possible situations it was and then go from there. It might be hard to talk about your feelings with each other but you will to have to fix the issue. If she isn't happy with the relationship and wants to break up you, you will have to accept the fact(even though you don't want to) that she wants to be single. I am not saying that you have to be okay with it, I am just preparing you with something that might happen since I have been on both ends of that situation.

Good luck with this and I hope that it works out in your favour.