SUBREDDIT: r/relationship_advice
TITLE: Help a (20m) out?
POST: Hi everyone!
So my girlfriend of a year and a half and I had a long talk tonight. She is depressed and is miserable in her life but is holding out hope that when we move out of her parents house things Wil lbe better. Which they will. And I'm fine with that due to me moving out here shortly. We had a long talk tonight about future though and how she doesn't see herself as a monogamisti(Sorry for spelling) person and wants to bring in another girl. Normally as a guy that'd be awesome woo. But I don't like the idea of having to compete for another for her love. I never saw myself in this situation and now I'm  confused. Do I let things play out and see how she'd change and maybe not want to do that? She is still young so she wants to experiment a lot. (She is 19). She has a low libido so my needs would hopefully be met with another women. But I'm terrified of losing her emotionally to someone else? What should I do?

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TL;DR: 
) girlfriend is depressed. Talked about adding another women to our relationship in the future and not sure how I should handle it.