Give him a chance and if happens again then leave him. Hitting is not allowed and it should be communicated that he is getting a last chance. Talk about life and not romance all the time and clear your future path which you wanna go as a new chapter has begun. You can’t stick to nostalgia. Move along.
Look at things he find annoying about you and it may improve. that’s the limit. Don’t think baby for 3 yrs atleast or you are done after that if it happens again.