I'm 26 and didn't know I had autism until recently

It ruined my last relationship. She is an amazing woman. I felt safe around her but constant miscommunication/misunderstandings, from me not understanding her to me not being able to put what's in my head into words that make sense killed the relationship. I always thought I just had anxiety but losing her made me reflect more and after doing research everything started to fall into place. Where I live an LPC can diagnose autism so I've been speaking to mine about it.

I miss my ex. she was a safe and comfortable space. she was so patient with me and part of me wants to avoid dating from now on because I feel like I won't ever understand people enough to have a long lasting relationship, and I don't want to hurt anyone else. she encouraged me to be more social and to speak more and when I was around her it still didn't feel natural exactly but I could do it. In the end the frequent miscommunications became too much and I lost her.