I'm going to ignore my ex best friend's texts
Why are you going to ignore your ex best friend's texts? Was there an issue between you two?
I'm going through a really tough time with him and I want him to give me some space.
I understand why you want some space, but it's rude to ignore someone who was once your best friend. I think you should let him know that you want some space, and ask him to stop contacting you for a while.
He deserves this.
If you really need to end contact that sometimes happens. Usually, it can be very hurtful to just ignore people.