Stay in my own lane or say something?

My best friend of 20 years is blatantly using a guy that’s in love with her to buy her things. She doesn’t want to commit to him or be intimate because he has a drinking problem. He has been to rehab and is really struggling with his addiction, but on numerous occasions, she’s had alcohol in-front of him and has had him purchase her alcohol. I’ve witnessed her freak out on him over the phone because he didn’t pick up because she needed new tires and wanted him to pay. I’m like this sugar daddy shit isn’t cute. He doesn’t make much money to begin with and he has two kids of his own to support. I believe he sticks around because she was there for him during rehab and she’s beautiful with a great personality. I guess I just expect better from her. We always have taken pride in the fact we are good people. We love genuinely and have empathy. This all just seems so hypocritical. I never knew her to rely on anyone for things. She was a go getter. What should I say? Or should I stay in my own lane.