How can I support my friend during this difficult time?

Okay so my friend and I are very close, she has told me multiple times that she trusts me. She recently broke it off with another friend who used her for , this happened about a month ago and she has been desperately trying to forget him but she can't. I can see she is still hurt, but she keeps telling me she is fine. Now she has been sleeping with another guy, going for a fwb approach. She tends to get attached easily. I told her that I disprove of this reckless behavior and tried to reason with her. I don't want to see her hurt again even though I'll be by her side it is very hard watch girls cry. I am a guy and I think that is my protective nature that makes me worry for her, frequently though we have been more flirty and doing some couple activities which is confusing me more. We have kept our relationship strictly platonic. What can I do to help her? I want to know if what I'm feeling is normal. She also has been telling me to have but i'm a virgin and I don't know how to take this. O.o