Watch it gets easier the longer you ignore for - and any contact at all sets you back, after some initial feeling better and justifying it to yourself, you realise you feel shit, and are mulling over what was said, etc etc
I have been there many times so know my stuff on this one.
You get a text, look at it, think 'cockhead' and don't reply.
Keep your phone on vibrate so it's easy to just shove the phone between some cushions and ignore the call
Keep busy with other stuff and if your mind wanders keep bringing your thoughts back to other things
Like I say, the longer you manage this for the easier it gets.
Three months here ignoring my ex, no contact at all - and it's SO good.
I'm about 26 months into ignoring another one which feels even better
So difficult at the the start, but so worth it in the end.