Men are very possessive. Generally speaking, he can't confirm that there are two kinds of relationships.
First, the woman is unwilling, so the reason why he is indifferent now is probably that he is disappointed and can only be ambiguous for so long. If a girl can really be with him, he can accept it, and he will end such a relationship.
Second, the man is unwilling, so his indifference is easy to understand. He is a playboy. I just want to have an affair with a woman. He was tired of playing now, so he changed people.
But the details have to be seen. There are other possibilities under different conditions. After all, we know very little about you now. The above is for your reference.