UGH SHES PISSING ME OFF

so I like this guy but he has a girlfriend and I respect that, so me and him will remain friends for now. My friend knows I like him but she still continues to text him all the time and I have to admit I’m jealous. I hate that she texts him because she’s so much prettier than me and I know that he’s going to end up liking her instead of me. Which is depressing because it happens all the time. This whole situation is just making me so angry and depressed. I dont know what to do. Please help moi.