wow --- what a lot of harsh advice you're getting!
I think you should consider seeing a Psychologist. If you had emotions in your younger years, but not now, then there is something causing the block of emotions now. It could have something to do with the difficult childhood, or it could be simply an imbalance of neurotransmitters.
If you love your girlfriend, and she loves you enough to stay with you and help you work this out - then don't let go of her.
The Autism advice is dumb --- autism doesn't suddenly develope as an adult. Get some professional advice --- don't ask a bunch of strangers on a website what they think. Good luck..........
1. Love ME no matter what noises are screaming at me, or who is trying to tear me down.
2. Eat to heal
3. Move to live
4. Embrace today
5. Live with intention
6. Respect my body
7. Cultivate joy
8. Find my passion
9. Meditate on peace in my soul