I Feel Unwanted

Sometimes I feel like I am just like some other girl or person to him. That maybe he just wants me gone so that he could be with someone else... I mean I don't blame him but still.... it sucks. I care so much for him and am always scared that he is going to leave one day, but he is just constantly pushing me to be with other people or I feel like he wants me to like other people.... I just feel like he couldn't care less about me or if I were to tell him bye.... I just want to feel important and wanted... loved....