Is it wrong to love a boy who's already loving some other girl? I don't want anything from him. I love him without any expectations of him loving me?

I just want to love him since he loved me once. Now he doesn't love me but his new love. Still I love him with no expectations of him loving me back nor I don't want to break his relationship with her. But I want to know if loving a boy who is already in love with some other girl is right or not?
Is it wrong to love a boy who's already loving some other girl? I don't want anything from him. I love him without any expectations of him loving me?
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