the silence may or may not be about you. its hard to say.
the black profile picture may or may not be about you. its hard to say.
he may simply be angry that you (or anyone) is having romantic luck, and he isnt. its hard to say.
Now I love my ex more than anything, but I'm in my mid twenties fought for him for 3 years and think I need to find a way to get out of depression and learn that I can be happy with someone else.
So I started talking to someone new.
i think this is an important turning point. even if you want him back, there is no path to that where every action or reaction pivots on his.
i wouldnt have told him. you dont owe that to him, and you dont need his permission to romantically engage someone. whats done is done, but i would not try to make him feel better about it, when you dont know what its really about.
dont chase.
as for whether youve lost him, this has happened several times if i recall. i know this is easier said than done, but i wouldnt sweat it. the fact that he is spinning, for whatever reason he is spinning, is not cause for you to spin.