<human>: Give me the gist of the text in a nutshell

I met this girl back in June of last year. At the time she was in a relationship. It was a 4 year relationship. She broke up with him in October and then in November, I started going out with her more. 

So we've been seeing each other for around 4 months. Things have been going good, talked about our feelings. We have pretty good communication. She's not ready for a relationship just yet, but wants us still. Anyways, Recently just discovered she's still been talking with her ex. Not by snooping, but because I asked her and she told me. I know she's not totally over him yet(4 year relationship, I get it.) but it hurt when she said she was still talking with him. She said he wants her back, but now their conversations are just platonic. 
She said she's told him that she's seeing me and everything. But I feel uneasy that she's still talking to him. I don't know how to approach this. Since I'm in no way in a position to say who she can and can't talk to. I want us to continue, I just don't want to get hurt. How could I phrase this so I don't come off as controlling? Or am I being just a baby and I should suck it up?
<bot>: Girl I'm seeing is talking to her ex still. It bugs me. How do I approach without seeing controlling? Or am I being a baby?