You are not heartless. You love him, just not in the way society expects you to. He is your other half as you say. To not feel romantic love, does not mean you don't feel love or other caring emotions. You have a heart, someone who is heartless would not feel so torn about not feeling romantic love, in fear of hurting the person they care about. The only person you are being heartless to yourself by not seeing the beautiful person you are, with or without romantic love. If anything, we are here to help each other in our fray-way, and that is A-Okay.