omigosh.. it means that you shouldn't be telling him something you don't mean. By you saying You Love him means that you're just joking with him and he's not taking what you said serious. I always say something I don't mean to guys and they always think I am not serious. I told this one guy I missed him alot and he teased me and said that I'm not serious even though I was. He;s not mad or anything, he's just teasing you.
And I hope this isn't the same guy who asked you for your pictures and you sent him half naked pictures of yourself because if he is I would run! Fast! not worth it because by you sending him half naked pics = I'm easy, let's have sex!