<human>: So the break-up was more or less mutual, although she brought it up. But she seemed to struggle with it more.

She was the one initiating contact, etc.

Then maybe 2-3 weeks after our break-up she already found a guy. She's been hanging out with him damn near every day now, and people say that it's a rebound, but is it?

She's clearly dressing better and exercising, etc for him.

My issue, is she is seeming more distant and I've noticed dishonesty (omitting things too), and her behavior has been selfish/cold. 

I understand people get a bit weird after the breakup.
But, she is the one that initiates contact. 

I feel like she first used me to get over me, and now has this guy to distract her.

My issue is, I loved the person she was when we were together. But the person she is now is really throwing me off.

I'm not trying to get back with her, I just want my friend back. Her and I were basically best friends for 2 years before we hooked up.
I was just wondering if you all had some insight. Is it something that just needs more time?

She basically omits the hanging out with this guy (although I know it's daily through mutual friends, and she stays over all the time), but she is the one initiating contact like suggesting lunch, which we've done every 2 weeks or so.

It's weird when the person you knew so well all of a sudden acts so differently.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: ex-gf wants to stay friends, but has been acting hot/cold and basically being dishonest but I don't know if it's to protect my feelings or if she has ulterior motives.