we were going to get marry and have many kids

same! and i always ask her nicely if she could stop flirting with my crush, but she was always telling me that she was doing it for me. i was like "how is you flirting with him helping me?"

Exactly that's not gonna help at all

it actually got to the point where she would tell me that i have no chance whatsoever and that she would look so much better with him. i was really sad because we were best friends...

That's not a friend sweety, that's a frenamie. Don't think she will change because she won't, it's best to not be friends with her anymore.

Yeah hiddlester you need to get some kind and loving friends because you deserve better than her

thanks you two :) she's actually a nice person as long as there is no guy involved. she's really pretty, so the guys are always way more interested in her than they are in me, and she "casually" reminds me all the time. she doesn't understand why i don't like it when she flirts with any guy that is even mildly interested in me...

A real friend wouldn't flirt with a guy you like no matter what. Who cares if you may think she's more pretty than you. Seriously, you don't need those types of people in your life trust me.