My (26F) girlfriend wants me (28M) to go fully vegan, but i don’t want to. Any advice?

So me 28M and my girlfriend 26F are having more issues lately about veganism. My girlfriend is vegan for about 5years now and we are dating for 7years. Over all the years i understand her choice and but i don’t want to go fully vegan. We cook vegan at home. There is a no meat rule ate home and of we go out and travel i also eat as much vegan as possible. Because i respect her choice and i do love her so much. When do i eat meat? When i am at work or out with my friends. Or sometimes when we are travelling and don’t find any options that suites me. But now she wants me to go fully vegan when i don’t want to. I feel like our relationship is falling apart because of this. Like she gave me an ultimatum. My heart hurts and i don’t know what to do. Any advice is greatly appreciated