How to deal with a break up

Just broke up with someone I was with for a year, he clearly has drinking issues when he drinks he sometimes forgets I existed for example today went about 6 hrs with out communication so I messaged him it’s over and blocked him off social media. Not only because he didn’t message me but I can’t see someone I love continue to hurt themselves . I’m a little down, although yes he has drinking issues he has a big heart And was good to me. Any suggestions on how to deal with the break up ?