He has major trust issues and is very paranoid plus he has very short temper...

Before 2 days he said he loves me more than anything and yesterday he blocked me after a fight. I am so sad dontI know what to do? Do you think his love disappeared....I tried to sent him couple of mails but no reply yet. I am so sad. This happens for 4th or 5th time and he always cone back but i fear this time it is permanent.  Do you think he will unblock me