Look. The answer is no.
My first piece of advice is that if you have a girlfriend who still chats with her ex you dump her. Literally tell her that she can't talk or be friends with him anymore, if she makes 1 excuse or defends it, walk. Leave her.
Because they fucked, they had feelings, mutual experiences.
A silver lining is that I am 99.9 percent they have fucked while you two have been a couple. So you've been cucked already.
Her emotions are not totally with you. You will get your cuck wishes but that relationship is over.
I repeat. If she is friends and talks with her ex leave.
I have never talked with an ex and it didn't get Sexual or emotional or hooked up. Talked about old times and it is what it is. Girls are worse.