My Girlfriend Of 5 Years, Jennifer, Who Is Currently Seeking

My girlfriend of 5 years, Jennifer, who is currently seeking help for codependency, has always been in touch on a regular basis with all of her exs.. She confessed to me early on that only once had she ever cheated..With her then girlfriends cousin.Deca. Only I know this information.. I feel it is unhealthy to keep all her exs in her life, but it remains.. However, the relationship with Deca continues , while many years ago Deca gave her a substantial amount of money and Deca still continues to pay for Jennifer's cell phone.. I don't know how to confront her about my fears. As I have many indications she is still sexually involved with her.