so sorry for your loss. nothing hurts like losing a big best friend, especially if he made you feel so safe and confident! there will be many more horses in your life that you will love and trust, of course, but still, it breaks your heart when a horse you love passes away.
and dump your boyfriend!!!! an animal you cared for for so long died and he "doesn't understand" why you're so sad.... er... seems to me like he just doesn't care, or doesn't have an empathetic bone in his body. good thing horses are sensitive and loving! <3