Trauma of losing a beloved pet dog - Newly engaged?

[idontknow]

My fiance and I have been engaged for just over 2 weeks, and in this time have had a severe loss when our beloved pet dog died in a hit and run accident. The day of our loss we were so compassionate with one another, however, almost a week later and we're like strangers. This whole weekend was packed with plans already made with friends and family, the little us time were spent either fighting or ignoring each other. Yesterday we eventually broke down, and talked about how we felt and how it's impossible to be happy during such a difficult time, having to still make arrangements etc. I had thought that things would get better, but today has been rather difficult, it's not easy to point to things but I just know in my heart that he's different. Now all these doubts are starting to surface such as whether he really loves me, and still wants to get married. I know it's silly, but I so much need him to not be different, although we're both dealing with heartache. How do we get through this? I just don't understand why this had to happen now, everything was so perfect and in an instant our whole worlds just turned upside down.
Thanks for everyone who's answered! Some people understand the devestation of losing a pet, others don't. I appreciate we are all different and have views and opinions that won't always collaborate. However, in our situation we truly love our animals, treat them like children that they even go on holiday with us. I don't believe it's anything to do with him not wanting to get married, I do agree with the person who said that he also needs some support. I think as woman we tend to be a bit selfish in that respect, and have this believe that men are strong both physically and emotionally, and by no means is this to say that he isn't, but because of this believe I tend to not feel like I have to emotionally always give him the support.

Thanks for everyone's answers, these situations are imperitive when one gets married, I trust this is a situation placed on our paths to help us work together as a team.