Ack.
Sucks. Breakups suck. It's really normal to get stuck in darkness. The collapse of all the dreams and warmth and all that comes from being with someone creates terrible stormy clouds in the mind and heart. People will tell you that time heals all wounds, but here and now that doesn't do much to alleviate the pain you're going through. I've been there.
Ripping off the band-aide, you have to accept that you lost her. She's gone. There are probably many reasons why, and 90% of them have nothing to do with you. You said something false... that she had everything you wanted in a woman. The truth is, one thing you wanted in a woman was a continued sparkling ember of love and desire to remain connected to you. She didn't have that for you, so she is really not the right woman for ya. Sorry bud, but you need to yank your mind out of the fantasy that she was perfect. Consider the qualities in her that you did like, take a deep breath, and stand up.
Time to move back toward your prerelationship hobbies and interests. Boot up the old game you havent played in awhile, pick up the drawing pad, go for a hike. You were whole before her, and its time to rediscover the wholeness. Apart from the relationship stuff, what do you like to do? What are your favorite activities? What are your favorite foods? What did you used to do that you haven't done in awhile? Do some of that.
Also, some quiet walking meditation in nature could help. Youtube has plenty of guided ones.
The light will come back eventually. Healing grief isn't about a lightswitch where if you could only find the right idea or circumstance you'd feel better. Its about letting the pain be without grabbing onto it and letting it define who you become from here. Yes, it hurts. Yes, it'll pass in time. Here and now you are still growing into the being you will be tomorrow, so don't lament your grief. Breathe, accept the suckage, keep walking.
Good luck.