My autistic boyfriend broke up with me due to burnout. I’m trying to understand and support him. Can anyone relate?

My boyfriend (27M) and I (26F) were together for four years. Until very recently, I truly believed we had a healthy, loving relationship.
Two weeks before we broke up, we celebrated our 4th anniversary. He wrote me a beautiful message saying he hoped we would be together forever. There were no obvious signs that he wanted to leave the relationship. Looking back, he says he had been struggling internally for a long time, but he never shared that with me.
Then, almost overnight from my perspective, he ended the relationship. He told me he loved me deeply but felt like he couldn’t sustain a relationship anymore. He said he felt emotionally numb, didn’t have energy for anything, and that med school had become overwhelming. At the time, neither of us knew he was autistic.
A few weeks later, he was diagnosed with autism. Since then, he has told me he now recognizes that he has experienced meltdowns throughout his life, and that he believes he is currently going through autistic burnout. He also told me he thinks the burnout played a major role in why he ended our relationship.
He has also said something that stayed with me: that I’m the only person who truly understands him.
What confuses me is that he hasn’t disappeared from my life.
We talk every day. He is often the one who asks to see me. He regularly asks how I’m doing and how my day was. When we’re together, everything feels very natural and comfortable. Sometimes he kisses me on the forehead or the nose, and on a few occasions he has even kissed me on the lips almost instinctively before stopping himself. It feels like he wants closeness but is also holding himself back.
At the same time, he tells me he can’t promise when he’ll feel better or whether he’ll be ready for a relationship again because he simply doesn’t know.
I love him very much, and I’m trying to understand this without making assumptions.
I also want to be honest about my own experience. This has been incredibly painful. I felt blindsided because I didn’t know he had been struggling. I would have wanted the chance to support him instead of losing the relationship without understanding what was happening. I sometimes feel hurt and frustrated, even while trying to understand his burnout.
So I wanted to ask autistic adults, especially those who have experienced burnout:
\-Have you ever pushed away someone you genuinely loved because you felt incapable of maintaining a relationship?
\-Did you experience emotional numbness or feel like you had no capacity left for your partner, even though you still loved them?
\-If you later recovered from burnout, did your feelings and ability to connect come back?
\-Is his behavior (still wanting to see me, talking to me every day, showing affection, but saying he can’t be in a relationship) something that makes sense from your perspective?
Most importantly, how can I support him without adding pressure while also taking care of myself?
I’m not looking for false hope or reassurance that we’ll definitely get back together. I know no one can predict that.
I’m simply trying to understand what this experience can feel like from the inside, because I love him very much, and I want to respond with empathy while also respecting both his needs and my own :(