Why am I looking for the bad?

Why am I trying so hard to find the bad in him? We had a great time when we were together but just wanted different things so we ended it. No drama just weren’t right for each other. I’ve been sad all week and while yes I cared for him I have other stuff going on in my life which makes this harder. Well today I hit my breaking point. I reached out cuz I just wanted to talk to him. He answered my first text and then didn’t reply to my second one. Then I called and no answer. He responded a few hours later and told me he was working on a house( which is something I’ve known for weeks and I forgot) but before I heard back from him I just assumed he didn’t care and was ignoring me. I know him! He may have fell short of what I wanted and he may be a lot of things. But I know he cared for me as a person. So why am I torturing myself by telling myself he doesn’t? Why are my feelings getting the best of me? Why can’t I trust I had a good judge of character.