This can be an unpopular opinion, but…While I found stupid the ghosting and I condemn his behavior, I wouldn’t expect a 20yo to know how to manage those kind of situations.
Also, trying again, trying harder, would not be a symptom of weakness: if you’re both willing to do it, you should; to clarify: trying harder does not mean to be more patient or tolerant towards things one does not like, but working to find better solutions for old and new problems.