Should I ask him to explain what happened? To get closure?

You said you were "totally over him." you already have closure. This clod doesn't deserve you. He used you in the past and he is trying to use you now. Frankly, the main question is why do you even text him. You shouldn't be even giving him the time of day. You need to make a concerted effort tom find another who will respect you, appreciated your giftsrand treat you like a lady. r