What does it mean when a guy doesn't want to lose you?

It depends on the type of guy and if you both are just friends or in a relationship. He may love you and enjoys your company, he may be afraid of losing you to someone you are close with. If he is sensitive, he may have lost someone in the past and wouldn't want to deal with the pain again. If you are in a relationship, he might be clingy? He might want you all for himself. He could be afraid that if he leaves you alone for a split second, you will meet someone else interesting and will have to share.. But if he in tough and not at all very sensitive, you should be proud! :) Hope this helped.