AITA for checking out emotionally after my girlfriend kept testing me?

I (23M) have been with my girlfriend for almost a year, and lately I feel emotionally drained. She constantly “tests” me to see if I really love her. For example, she’ll purposely ignore my texts for hours to see if I double text, randomly mention other guys to make me jealous, or say things like “I bet if we broke up you’d move on fast” just to watch my reaction.

At first I tried reassuring her because I know people can be insecure sometimes. But after months of this, I started feeling like I’m in a relationship where I always have to prove myself instead of just being trusted.

The breaking point was when she made a fake Instagram account to DM me and see if I’d flirt back. I figured it out almost immediately and confronted her about it. Instead of apologizing, she said she “needed peace of mind.” I told her I’m tired of the games and since then I’ve been distant emotionally.

Now she says I’ve become cold and uncaring, while I feel like I’m just exhausted from constantly defending my loyalty.

AITA for emotionally checking out after being tested so much?