Guy dilemma?

This guy I have been texting misinterpreted what I said in a text to mean that I wasn’t interested in him. I reassured him that I was interested in him yet wanted to proceed as mates and see if anything developed. I then accidently called him and he asked me if I meant to call. I said it was an accident and his response was that he thought I did it intentionally. I have accidently called him twice in the past but he was understanding about it then as it was a genuine mistake. Why did he not believe me this time? Should I text him back clarifying the situation? We have had 3 dates and like each other. However due to a long distance situation and Covid we have not been able to officially date, although I have known him for 2 years.