Different folk react differently. Your desire to know you still love your father is the side that is horrified at the thought you could ever be baize about it, but life goes on and you may find the intensity fades for you eventually. But if it doesn't, it doesn't. After all it isn't affecting how you live your live, but simply gives the occasional period of melancholy. I'd advise accepting this is you. If it really bothers you, you can work towards moving on, but until you are sure, it's ok to feel like that.