Most Helpful Girl
It depends on how invested she was, some girls need months before even considering other guys, other are happy to be out- so you should try to figure that out first, look for signs if she doesn’t tell you, for example talking about her ex a lot is a sign, if she talks about things they did and things that remind her of him, then she’s most likely not over him
Most Helpful Guy
Depends on what kind of break up it was. You can be her friend and comfort her if the break up was nasty.
Personally, I think that you need to ask the girl about it and she will tell you. But don't back down easily - ask if she still wants to hang out since you're trying to clear her thoughts 😄