I'm falling in love with a god friend of my current girlfriend. I used to be unsure if I actually loved her, but the more I'm with her and the more I'm with my gf, things become more certain. I notice my feelings for my girlfriend fading, and I enjoy spending (romantic) time with her considerably less. Her friend (who I've actually known for longer than my girlfriend) however, is becoming more and more interesting to me as time passes. Every time I talk to her, things seem so perfect. Each new second I spend with her makes me more and more certain that shes the one I'm meant to be with. I'm fairly certain that she's interested in me, too.
But of course there's an issue. I still admire and respect my current girlfriend, and I would love to remain friends with her. She is slightly emotionally unstable and the breakup would really hurt her. I was once talking about our future together. I told her that no matter what, I don't want her to worry about hurting me if she feels like the relationship isn't working out. I said this because she seems to still have feelings for some former loves, and I hated the thought of our commitment ruining her true feelings. At this point I was still in love with her, but I worry about her so much that I felt it was the right thing to tell her this. However, just the entirely hypothetical thought of breaking up with me reduced her to tears. I can't imagine what it would be like if we actually split.
Then there's but another issue; she's good friends with the girl I love. I see them both frequently (together) and enjoy spending time with both of them at once. I couldn't stand it if my choices did too much to hurt their friendship or the good times we have together.
I really don't have any idea how to approach the situation. I don't know who to talk to first, or what to say. I don't know how I can possibly make the situation okay between them and ensure that there is no bitterness towards myself or either girl. It seems impossible. I assume I should wait awhile after the breakup, not an immediate switch (which would make it obvious that I left my gf for her friend). I know the situation will not be perfect and there's no way to make sure of everything I've stated. But if anybody has any information on how to approach the situation or answers to any of my questions, I would love (and truly need) the help. Thanks so much and I'm dying for some good advice.