<human>: One of my closest friends is incredibly codependent. I try and be there for her, give her advice and help her when she's down. We connect on a lot of levels and I value her insight in many areas.

Her romantic relationships are messy, to say the least. She is constantly obsessed with someone that has no interest in her, and hangs on for years. She will consistently abandon me to spend time with these men who use her repeatedly, and then comes to me. I've tried every method of communication with her, gentle, tough love, waiting it out. I don't know what else to do. 

I've tried to set boundaries- when we are spending time together you can't just leave in the middle- but her attachment to these people is so strong she can't say no. It hurts to watch her abandon our healthy relationship to seek out people that make her feel bad.

Please, /r/relationships, help me help my friend.

Can you provide a brief overview of the text?
<bot>: best friend is extremely codependent and often ditches me to spend time in very unhealthy relationships. Won't listen to advice.