Mi novia enamorada de mi hermano

I am 18 years old and I am a man. I'm dating a 19 year old girl. Our relationship has always been a little toxic: nothing extreme, but she is quite jealous.

I have a 27-year-old brother, a police officer, tall, handsome and with a good salary. He is very flirtatious with women, but that is the way he treats people. From the beginning I asked him not to flirt with my girlfriend and he understood without a problem.

Over time, every time my brother was with my girlfriend, I felt like she liked him. I tried to talk to her about it, but she always denied it. I trust my brother because he has helped me a lot and I know he would not betray me.

Two days ago, while she was taking a shower, her cell phone was left on the table and notifications were arriving. I couldn't resist and checked it out. I saw messages from her best friend, where I advised her to leave me to go after my brother. I was paralyzed.

I checked more conversations and found out that she has a crush on him since the first time she saw him. There was no evidence that anything had happened between them, but I still felt terrible. I left my phone on the table, left, came home, lay down on the bed and cried.

Now I don't know what to do. I don't know whether to talk to my brother, even though he hasn't done anything. I don't know whether to face her or just leave it. I'm lost and need advice.