Im questioning my relationship what should i do?

I have been dating this girl for 3 weeks im pretty sure shes the one. There is allot of things working against are relationship. She has a best friend a guy she use to date who is in prison still. She says she is just friends and does not want a relationship with him.She still goes to visit him and says shes still going to help him get back on his feet. Im starting to be live she is just using me till he gets out which could be soon. She tells me she loves me and wishes i new how Amazing i am, she also says shes never dated anyone like me. She also has quite a few guy friends who use to be fwb for her and she has not told any of them that she is dating me. I don't know what to do any advice is appreciated.