My avoidant is actually trying to change

My avoidant partner and I went through several break ups and make ups. Recently he discarded me out of the blue, said dont wanna do this anymore, no final conversation. Then 3 weeks later came back, said he's been going to therapy (he still does), been doing shadow work, explain the hedgehog theory, apologize for it all and wanna work things out again. We talked, he admitted to being an avoidant and working on healing. He asked for help. I did notice lots of change in communication, he doesn't run away and just being cold like before, continue to stay and work things through; some days are harder but hes still here. But somehow I feel like Ive been conditioned to fear that it will vanish out of nowhere again. So much hurtful things had happened, some days are difficult. Is there hope?