I (24M) found out my girlfriend (24F) has been lying to me about going to a therapist, and I'm seeing red

I apologize for the length of this post. I just need some help here.<br><br>I've been with my girlfriend for 2 years, and we live together. We have a good relationship. She's kind of an introvert, and suffers from anxiety attacks.<br><br>She was admitted to a psychiatric hospital for 3 months last year due to a serious breakdown. She felt really ashamed of it, which I can understand. She got lots of therapy in there, and I visited her every chance I got. She was doing much better when she got out. I was so proud of her and seeing her recover was an amazing feeling.<br><br>We decided she needed to continue going to therapy, and she said she found a great therapist who still had openings for new patients. I was overjoyed because it took her **months** to find one she could get an appointment with.<br><br>Three months ago however, she had another breakdown, and attacked me. I was sleeping when it happened. I don't know what triggered it, I just know that I woke up to her hitting me and saying really nasty things. She wasn't at all present, and I literally had to fight to keep her from actually injuring me. I didn't hit her back and I didn't restrain her, but at one point I had to block a particularly nasty comment by pressing my hand over her face. In my defense, I was half asleep, in pain, and terrified, so my reaction skills were not the best.<br><br>I was really shocked and hurt, and after I calmed her down I said I wasn't OK with what happened and she shouldn't do that again. She agreed and things went back to normal.<br><br>Fast forward to 3 weeks ago, when I had another incident similar to the one mentioned above. She attacked and hit me, but this time I was more prepared. I still didn't hit her, but I gently pushed her away from me and got up from the bed. When she calmed down she said she was really sorry, it wasn't her fault, and that she'd talk about it to her therapist. I agreed, and she seemed better.<br><br>Last week however, we were talking and I asked her how her last visit to the therapist went. To my utter shock, she said she never actually went to the therapist, she just scheduled an appointment that she never went to. I felt like the world crashed down on me. I honestly can't describe the feeling of hurt and betrayal I felt at that moment. She admitted she was afraid of disappointing me, so she lied. It made sense, as she felt bad for being hospitalized.<br><br>At this point it's been almost 6 months since her last attack, but to think that she lied about this for so long and made me believe she was actively working on her mental health. I know I shouldn't be mad at her for doing this, that she just needs more help, but can't help but feel betrayed. I could've done something to help her if she just told me the truth. I know this incident won't be the last one, and I'm dreading the next time she'll snap and hurt me. Am I overreacting? What should I do?<br><br>Tldr: after my girlfriend suffered a mental breakdown I thought she was going to therapy for months, but she lied to me and never went. I'm hurt and I don't know what to do.