Don't send him any texts as it's evident he is avoiding you. It is a difficult step to do but it's the right step to avoid falling into the pit of depression.
Don't send him another text for a minimum of two weeks. During this period you should concentrate your mind on things concerning you.
If he doesn't contact you within the two weeks, wait another two weeks of not contacting him.
Why should you not contact him? By not contacting him, you are preparing your heart and mind to accept there might be a breakup, and to gain the strength to move on.
After one month of no contact, send him a text to thank him and wish him all the best. Let him know it was cruel to treat you this way by ghosting you instead of letting you know he doesn't want to continue in the relationship.
This is a case of ghosting - not responding to your texts and not calling you.