Is it normal to love some one that will never love you?

I loved my ex so much he was my life. He is an addict and spent a lot of time in prison. I know he was not nice to me and did not love me. I still can't seem to help myself and it is hard to make it passed every day. I will never understand why he was mean and why he will never talk to me again. I could not handle him being an addict and he would not quit or slow down. He loved to mess with my head and tell me all kinds of mixed things. He was very sick and good at what he did to me. I just wish so much I did not care about him. I don't know how to stop caring. I am seeing some one that loves me, but I don't love him. He knows it, but can't help him self. I don't know if I can ever love the one I am dating. He tells me all the time how he feels and he would do any thing to have me as his gf. I still love my ex and don't know if I could love him that way. I feel like I can't love my date like that. I don't seem to like the things my date does. He does things so different then I do, and I don't seem to like them. He is nice and I just don't know what to do? I did tell the date every thing. So as he still tries to make me his. I can not seem to feel the same. I still love my ex. It has only been a bit over a month now. But the date is working very hard to win me over. I met him less then two weeks after my ex. I was just starting to try to date. I try hard to tell the date this, but still he tells me I am his gf. I tell him I am not ready and want to be friends. I am so confused about my ex and now a man that wants to be the only one in my life and will keep trying to be that. Don't want me to date any one else. I think I should stop seeing the date that don't stop and just be my friend. I need to find some way to get over my ex I was with two years. I loved him so greatly and now it is like he died. He will never talk or see me again. I am lost and can't love some one else yet!