How can I rekindle a relationship after my mistake?

r/

Myself (31F) has been dating my boyfriend for a year and half (36M). The beginning of this relationship was my dream come true, he is beyond handsome and has a great fun personality that I love! Over the course of the relationship I lost my job twice (not for anything I did but was still tough) and my dad who has always been an alcoholic was in a very very bad place and then got sent to rehab (which added a lot of stress, after 50+ years he is now sober, so ended in a positive), plus a few other small things outside of my relationship that caused a lot of worry.

I think all the stress made me lose track of all my emotions and I stated becoming less confident and had a fear I would lose my boyfriend to someone better (as this has happened in the past to a previous relationship). I was putting up road blocks and making scenarios up which I know was immature but in a sense thought I was protecting myself. I am very much aware of where I went wrong, I focus a lot on mental health and healthy relationships but can’t seem to take my advice in the moment.

Anyways yesterday he broke down and let me know I broke him, he was very upset and how I was enough but I wasn’t seeing it and he left me. I know that time is needed and I need to work on myself but I’m coming here for advice on how I can help myself and if anyone has an idea on how I could hopefully rekindle this relationship to what it once was sometime in the future?

TL;DR
I was overthinking and broke our great relationship, how can I fix this to rekindle a future (other than time and space which I will of course give)