dear Amali, welcome to this site and for wanting to post your comment.
No, any break-up is never easy, but the reason you have done this, and this is your second time is because he has been manipulative so you couldn't trust him, and it does seem as though you want to do this deep down, because you haven't responded to his text messages.
No one wants to see their previous partner/ex-spouse with someone else, but he will go from his next partner and then to another one simply because he will be using them as well.
There is a concern here in that this may cause PTSD for you, but it won't happen if you can get another person to form a relationship, so I'm not sure whether you are working or going to school/uni, but it would be best to see your doctor, because your social anxiety has to be dealt with.
I hated seeing my ex and the person see is living with, as he is never allowed to come to any function or gatherings at all. L Geoff. x