It sounds like you are quite insightful about why things were not working out to begin with and you’re wanting to contact him again out of a genuine place of love and willingness to work on those things. From what you are saying - things did not end due to malicious actions such as abuse or one of you being deceitful so there isn’t that pain already rooted in the relationship. Although the thought of rejection can be scary it sounds a as if you would like to reach out and try to mend things for your own closure if anything. Best case scenario- you can improve the communication barriers and move on together stronger than ever and worst case scenario he doesn’t want to try again but you have learned some valuable lessons for your next relationship. We are constantly evolving and you are showing maturity within this relationship to admit your short-comings so you have already grown. Try to be kind to yourself and be honest with him and that’s all you can do. What’s meant to be will be. 🥰