Why is he so angry at me?

My ex broke up with me a year ago and hasn’t left me alone since. I don’t always respond to his communications. There have been gaps. But I never reach out to him as never begged him to not break up with me. If I don’t respond to his communication, he’ll email, Instagram etc. when we have spent time together, he’s much more vulnerable whe drunk but when he’s sober he never wants to talk about his feelings. Even though most recently he admitted he of course still had feelings but doesn’t know he wants and doesn’t want to be pressured. But when he’s sober and we get close or something, he almost gets angry and wants space. I don’t know why he’s projecting his anger frustration on to me when he’s the one who doesn’t leave me alone. I’m so confused!!
Why is he so angry at me?
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