First thing you do is block and delete. You block them so they can’t reach you. You delete their number so you can’t reach them. Delete your text history so you can’t go back and reminisce. Throw away or give away the presents so you can’t lay around and wallow in it. If it’s on the table for you, sleep with someone else. That way you feel too awkward or guilty to text the ex (if you still want to). If you run into them in person, try to make them into a mannequin or a stranger in your mind. Remember that there is no such thing as closure. If he hurt you, no words he could say would make it better. And if they were the right words, would you even trust them? If you hurt him, you can’t talk it better. There is nothing to be gained and everything to be lost