Friends with your bf ex ?

So this girl hit me up in Social media asking if I was interested on buying stuff she sale I said I’m not interested then the conversation going to my now bf which Is her ex they broke up 5yrs.then I I ask about her blah blah then she told me what happened to them why they broke up she cheated on him then I told her that the bf cheated on me recently and I’m mad but I forgive her him blah blah.then now she’s want to hang out with me lol

The bf option he said block her don’t talk to her like I don’t want to be rude to her. Should I just not hang with her?