AITA for telling my girlfriend to find a new gym after I walked in on her being a asshole to staff.

I somewhat regret writing this but I feel I need feed back. I'm in a 3 year relationship with my girlfriend. We are living together and thinking about marriage . There is a gym on the way home from work that we both go to. I typically go in the morning and she goes right after work. We carpool to work in the morning. We use a parking lot 2 blocks from her work but I walk 5 more blocks to mine.<br><br>I had to come home early from work today because I had food poisoning. It hit me like a ton of bricks and I had to find a bathroom. I was near the gym so I went in to use the bathroom and I could tell I was a few minutes from explosive diarrhea. I told the front desk my issue and they let me in to use the bathroom without my membership card (which is at home) and they were very nice about it. I get in the bathroom and about 30 seconds later a guy comes in yelling that he doesn't have his scan card. He doesn't bother the first guy in the stall but when he hears the bathroom door open he think its another staff member. It's me and he is pissed that I'm not helping him and that he doesn't have time for this shit. He tells me he's going to complain to my superiors and that I don't care about the members or I would let him in. I tell him I'm not staff and to stop yelling at me I have to go to the bathroom. He still doesn't believe me and tells me to prove it by showing him my work badge. I don't have my work badge because I left work early to use the bathroom. I show him my work ID and he tells me that doesn't prove anything. Then he calls his girlfriend on the phone to come down and prove that I'm staff because he knows her and I don't. I hear him talk about me being a lazy staff member and that I don't give a FUCK about the members. I hear him ask for his gym points back and for the call from a manager. At this point I'm really hoping he's the asshole and not me. The girl that walks in is my girlfriend and I don't want to ruin her day but he tells her that I'm a gym employee and I wouldn't let him in. When she realizes I'm the guy in the bathroom her expression shows guilt. Then totally changes to anger and I can tell she is trying to come up with an excuse. She tells her boyfriend that she can't believe I'm treating a member so poorly and she is going to speak to my manager. I finish my business and tell her what really happened. And I tell her that the staff is good people and she disrespects them and tries to humiliate them. I tell her I think we need to take a break and I suggest she finds a new gym. She told me she's sorry and I can't go telling other people that she's a bitch. I told her that treats people poorly all the time and I'm done.<br><br>Ok so I get home and sort of cool off. I'm still really pissed off at her though. I call my parents and tell them what happened. My dad thinks she's TA and my mom thinks I'm TA for not telling her when we were both in the bathroom. I really don't know what to do about this. I want to take a break until I can think about our future.<br><br>Edit: I'll answer a few questions I've had a bunch. I can't remember exactly what I said but I think I said something like I'm in a crisis right now I need the bathroom or I'm going to shit my self. Or something like that. I remember saying to please let me use the bathroom. I've been going to that gym for about 4 years and I know the staff well. The lady at the desk knows me pretty well from working out next to me on several occasions. If I had been some random person off the street I doubt they would have let me in. Yes I could have just waited for her to arrive. I really couldn't wait though. <br><br>As far as recognizing me. I didn't have my gym shirt on or anything but he did see me walk in when he was in the bathroom before me. He just didn't remember me because he has the memory of a goldfish. <br><br>This is the first time I really remember her treating someone poorly and getting caught. There are little things that lead me to believe she treats people poorly when I'm not around. She wants other people to do all the work while she gets all the credit. She'll only be nice to people if she thinks they can help her in some way. She dodges helping anyone she can. I have been ignoring all this but this was too much.