Hey there. I was in a similar situation. I met this girl (While I was dating a guy) and we fell in love. We kind of had a relationship, and eventually I needed to end my relationship with my boyfriend and made a complete commitment to her. It only lasted a few weeks, and then our relationship crumbled. She decided she was ready to date guys again, wanted to have another child (She has 2 from an ex-husband) and just wasn't comfortable facing society as a lesbian/bisexual.

It was the most painful time of my life when I had to let her go. We would kind of be together for 4 days, then she'd call it off. we would spend about 4 days living together, doing everything together, and then she'd withdraw.
We tried the "friends with benefits" approach, but every time we got together, there were too many emotions and we couldn't just walk away.
Even being friends was hard, as the emotions were too strong.
This continuous yo-yo relationship was poison to me, and it had to end.
I landed up in hospital after a S*, as I just couldn't deal with it, but it was a wake-up call for me.
I wish you all the strength in the world, but do know that you'll get through this.

You have realised that she's not good for you, so walk away and start your life afreash. Find someone who'll give you 100%, which is what every person deserves.

((HUGS)) - I'm here for you if you want to chat.