Most Helpful Girl
Just say you'd rather the two of you just be friends and that you don't feel it's right to take the relationship any further. And be honest with the reasons, it helps women to know the reasons why, because forever wondering where we went wrong can be really stressful, whereas once you know you can deal with it.
And then ACTUALLY put effort into the friendship. Because this just happened to me "I want us to only be friends" but then he hasn't contacted or replied to me at all? Like I'm sorry but thats not friends. So ensure you still hang out and make time for her if you truly want to keep the friendship.