As for you, that man is a playboy. Is this evaluation objective? Is it because you care too much about him that you think he is playing ambiguous when he speaks and greets other girls? What do other friends around him say about him? How does he evaluate himself? Psychologically speaking, flower heart is the innate ability of animals, and both men and women will have this innate ability.
The factors that can control his ability can only be restricted by his own moral strength. So if he is a playboy and doesn't hurt people around him, he is basically very self-disciplined. Then if you want him to be single-minded and loyal to you, you can negotiate with him. Express your expectations or requirements. But that's all. Whether he can do this is beyond your control.
So if you choose such a person, you should bravely bear the consequences of your choice. Of course, if he likes you enough and loves you enough, he may also change for you. Become loyal and single-minded It depends on your charm.