You are in a tough spot no doubt. Have you been open with her about the intimacy issues? I understand how you love her and that may always be there but as you know a relationship needs the sexual component as well. How have you managed to stay for 5 years? Has it always been this way or has it recently changed? If you used to be attracted to her then you might want to look at what might have caused this shift. It is normal for that rush that exists at the start of relationships to calm down and settle. I know you feel guilty if you leave, but you must ask yourself what you truly desire for yourself moving forward and if you can't see a full life with her, then that is important.
I am not able to provide a call but am happy to chat with you here.
Let me know how I can support you.