Im in love with my best friend

So me and my best friend have been besties for at least three years and I have realized that I am in love with him. I don't know what to do. He is however in a relationship right now and I know that they're gonna break up soon he informed me and stuff but idk what to do like I'm not gonna try and break them up. But here our some of our convos so you understand why I love him so much these are the most recent ones as well.