That's tough one. But I'll tell you what I told my little sister about expecting things from people:

Don't.

Don't expect to be treated the same way you treat others. Because you'll be disappointed and resentful. Yeah, it'd be nice if people were there for you the way you are for them. But you do this to be selfless and caring. Not because you expect anything in return.

Because most of the time, they won't do it. They don't see things the way you and I do.

Yeah, you should talk to her. Be honest. Tell her you need a friend to talk to about this because it will help you move on. Don't be angry or upset, or even expect anything to change about her "bragging" and being competitive. I hope she'll empathize with you and be there for you. But don't expect her to do this. Just let it happen.

I'm not saying you should be a pessimist - just be real. Most people do things that disappoint because we expect them to be something they aren't. Talk to her about it and see what happens. At this point, it's the best both of you can do.

In the meantime, I'm really sorry about your breakup. It's tough (I'm divorced). It's hard to move on sometimes, and even harder when you feel lonely and sad. I hope you are OK, and remember to take care of yourself.