Getting married

Iv been with my boyfriend for five years this August, we bought a house and are trying for a baby not with much luck. We have a fantastic relationship we laugh everyday but there is one thing he just doesn't want to get married and I do desperately. I'm feeling like I'm starting to resent him for this especially as my father has been dignosed with terminal cancer and may only have 2 years left. It's been a really tough six months as we only found this out in sept 2015. It's turned our lives upside down my mother, younger sister and myself are deverstated. I don't understand why my boyfriend won't do this for me, it's not like I only just want to get married iv been wanting it for years which he is fully aware of. 
I feel I'm being robbed of a day every girl dreams of. Obviously I would love my dad to walk me down the isle. I feel like time is running out. I tried talking with my partner last night but he just says he doesn't want to do it. So I have to decide to leave a happy relationship probably sell our house and move into a flat or once and for all accept il never be a bride and be able to call my man my husband! I want to know if anyone is in the same boat or am I being utterly ridiculous??? I can't help it the thought il never get my big day kills me and I'm worried il always resent him for this and hold it against him. My head is boggled!