I lost my Dad in an road accident when I was 17. There's no doubt that such a loss at a young age profoundly changes you for good. It's left me with a number of neurotic quirks which I had to explain to my husband when we first got together, e.g.
I absolutely have to know if someone is going to be home - my husband texts me every day when he's setting off and again if he's delayed. If he is even ten minutes late with no warning, I fret.
I have a huge fear of losing the people I love. (In the sense that I dwell on it a lot.) I'm rubbish at living in the moment, I worry about the future all the time. Basically, got a nasty life lesson that a comfortable, normal life can rapidly unravel with no warning whatsoever. As a result, I never quite feel secure. I'm cautious in lost aspects of my life (money, plans etc.)
I crave security. Big life decisions like changing jobs, moving areas etc are hard for me.
And the good stuff...
I never ever go to bed on a quarrel (in fact, I don't quarrel much at all. I don't sweat the trivial stuff in relationships because I'm aware how insignificant it is.) I always make sure I tell my family and friends that I love them regularly. I never ever take the presence of a loved one for granted. I value them every day.
Work is just work- I never let it sidetrack me from family and life. It pays the bills but in the grand scheme of things it's not important. Ditto belongings.
I have had my fair share of disastrous relationships. But I consciously chose a life partner who was steady, reliable and straightforward (because that's exactly what I needed.) We've been together for 20 years and we're very happy. 
It's totally possible to have a happy life after childhood bereavement - but you need to have grieved properly and not have buried the pain as some do. You also need to have a good understanding of how the trauma has impacted you so you can share your needs with a partner.
I hope this is your guy, OP. If you are dealing with someone who is repressing things, it'll be challenging.
Hope that helps! Good luck!