my boyfriend(or shall i say ex now) randomly blocked my # after 4 years of being together?

so me and this guy had been together for 4 years, and he randomly blocked my number and will not respond if I text or call from another phone? we never ended things but im assuming it is over. it has been 3 weeks since it happened. we got into a small fight because I wasn't gonna come over till night time since things came up in the morning that did not allow me to go over as planned. after the fight I just stoped texting back because I wanted to allow us to cool off and to my surprise he doesn't try talking to me anymore and when I try I find my number is blocked. idk whats going on. ive tried hundreds of times and nothing. I even drov eto hi house and he just hides. idk whats going on or what even happened or what to do. help please?