boyfriend moved on in one month

my ex and i dated for 4 years, he broke up with me and moved on to another woman only a month later.

i literally don’t know how to cope with this. i loved him with my entire being and wanted to marry him. we would always talk about our future together and we were very serious. 20 minutes before he broke up with me he was telling me he’ll always be in my life no matter what etc and he’s blocked me everywhere.

what am i even supposed to do. i can’t go out and meet new people, i am bedridden with health issue. all i can do is lay in bed and think about him. how the hell am i supposed to move on?? i can’t believe he just left me like this after 4 years of dating and our entire lives being best friends.