I think my girlfriend cheated on my last night

New to this, need some outside opinions.

My girlfriend and I work the same job and have the same friends, I left work early and she stayed until close (bartenders)

I asked her when i’m seeing her after work, she said she’d like a night to herself which is okay

Then she decides to go out to the bar with my friend and didn’t want me to come, I have her location on.

Around 1:30 she said she got home and she did, said goodnight and that’s that.

Something was playing on my mind, so I checked her location at 2ish and she wasn’t in her flat, she was in her apartment complex but not in her flat, the location is very precise.

So I start freaking out that she lied to me about going to sleep, I frantically call and text, she doesn’t pick up once.

Wake up this morning and she says she’s been in her room all night when I know the location is so pinpoint, I’m not sure she knows that.

I called my friend who she was with too and he didn’t pick up either, eventually I saw her little icon walk back to her flat.

She gets really defensive when I show her the difference in location through the screenshots and is outraged that I’d accuse her of such a thing.

If I call late at night she will respond immediately, drunk or not.

I don’t know what to do, I’m going to see her in person later but I don’t know what to think.