u/Immediate-Stick4855

We are currently about to hit our 5-month anniversary, and it’s been a great journey so far. Even though we’re young (M22, F23), I’m certain she’s the person I want to marry, have a family with, and build a future alongside.
Our story began last year, but we actually went to high school together seven years ago. We rarely spoke back then, though to me, she was always the prettiest girl in school. We reconnected last March at the university gym; I’m an Olympic weightlifter, and she had just started training again. When I first saw her, I just gave a simple "hello," never imagining she’d remember me. About a month later, we developed a very strong friendship.
At that time, she met a girl at the gym (M), and the three of us became close friends. Eventually, M started liking me. I was never interested in M and made that clear from the start, keeping things strictly platonic. My relationship with my current girlfriend was also platonic back then. I never imagined we’d date because she is bisexual but mostly leaned toward women. That summer, my girlfriend, M, another friend (Y), and I planned a trip to the beach. Y had actually started lifting weights just to get close to my girlfriend, but my girlfriend only saw her as a friend.
While at the beach, M and Y went off on their own, leaving my girlfriend and me alone. There was a lot of tension between us. She asked me about my life goals and my future; I told her, and then she confessed that she saw me as a partner—someone she could see herself marrying and starting a family with. I didn't take it too seriously at the moment because I assumed she preferred women, so we returned from the trip and remained close friends. She was always there for me, even though she struggled with diagnosed depression and anxiety, which made it hard for her to open up at first.
In October, I met another girl (M2) at the gym. Since I had been single for a long time, I gave it a shot. We had a connection, but it didn't work out after two weeks. During that time, M2 and my girlfriend actually became friends.
By my birthday in November, I threw a party and invited M and my girlfriend. Late that night, while only a few friends remained, my girlfriend and I were sitting together. She rested her leg on mine; I placed my hand on her leg and asked if she minded. She said no. A few minutes later, she offered me a beer, and I replied, "Thanks, beautiful." We ended up holding hands. Later, I followed her into the bathroom and kissed her. She kissed me back.
We decided to start a relationship but kept it secret at first, fearing people would judge her for being with me since M liked me and I had briefly dated M2. However, during my graduation photos two weeks later, M noticed the way I held my girlfriend and realized the truth. She reacted poorly, calling us "the worst" and claiming we betrayed her.
We officially became a couple two days after that. Since then, M has treated my girlfriend terribly—ignoring her, talking behind her back, and only reaching out when it’s convenient. This caused my girlfriend’s depression to spiral because she felt she lost her best friend. Eventually, M, M2, and Y made the gym—her only sanctuary—so uncomfortable that she stopped going. Now, she’s withdrawn, unable to work or go to school.
Lately, I’ve also had financial struggles that have affected us. I sometimes run out of money because I try to give her everything I can. We've also had communication issues that I’m working hard to resolve.
Over the last few weeks, she’s stayed locked away. We barely see each other, and physical contact has disappeared over the last three months. I don't just want her for sex—I love every part of her—but the lack of intimacy is hard to process. For the last two days, she won’t even kiss me on the mouth, only the cheek. I want to be empathetic because I know she feels "deplorable" and lacks the energy for anything, but I don't know how to help. When I ask what I can do, she says "nothing" and that it will pass, but it's been five months and I can't stand seeing her this sad. Please help.