Hope you're doing well mate.
I've thankfully never experienced the loss of a significant other so I can't truly imagine what that must be like. However the thing that has helped me with losing loved ones in the past is thinking about how they have impacted my life, made me be a better person, taught me and others things, etc. etc. I know it sounds cheesy and stupid but it's about the only way I can come to terms with someone's passing, by knowing that pieces of their influence live on in all of those around them even though they might not realize it. At the very least it makes me appreciative of the time I had with them.
All the best,
DB