<human>: Okay, so my friend doesn't use Reddit but wanted some advice so we're together and I'm basically putting all her thoughts into words.

To start off, They met in high school and they were best friends for years before they'd actually began dating. They realised that the friendship had turned into more and that they wanted to be together as more than friends. They've now been together three years and have a child. 

My friend has always been open about being bisexual but she is starting to realize that she's gay and not bisexual. So the biggest issue is that they're both young and living together but she feels like being with a man, any man. something will always be missing and she can't really truly love a man like she could with a woman. 

She said she still loves him but being with him isn't what's going to make her happy. How can she be?

So, what is the best course of action in this scenario, how does my friend come ahead? 

Thanks to all who answer, any advice or even stories you may have is greatly appreciated.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Best friend wants to leave her boyfriend of three years whom she has a child with but doesn't know how to go about it because she doesn't want to hurt him, but she is gay.