<human>: Can you succinctly summarize the text in 1-3 sentences?

So here's my condensed story:

Been with this wonderful young woman for a little over two years. We met at a coffee shop that I had worked at for a while. I trained her her first few days, as I was leaving that coffee shop for another job. I had a girlfriend at the time, which I was open about, but desperately wanted to take her to dinner. She agreed, and it's been a great couple of years since. I'm 25, and she's 23. (since people will probably ask)

I've since gotten my "big boy" job and am working my way into my career, to which she is incredibly supportive, even when I have to travel for a week at a time. And she now manages said coffee shop. We've been living together about a year and a half. We are raising a puppy together. We're a pretty dynamic duo as far as accomplishing tasks both separately and together, and taking care of our home / hosting and entertaining our friends and family. 

We're not totally perfect, and we're OK with that, because we both understand no one is that great all the time, especially when you're together so often. We see eye to eye on all sort of religious and social aspects, and all that - so we know it "works." 

And now the kicker: I was raised in a family where literally no marriage has survived since my grandparent's generation. My parents first and second (both to different spouses) marriages are all miserable. Aunts, uncles, older cousins, even my brother is on his second marriage and he's only 28. Ever since I was young, there was nothing but fighting and misery associated with any sort of long term relationship I was exposed to. This has always caused some commitment issues with long term relationships of my own, until I decided that when I met her, my own happiness was more important than the misery of my family following me through life. I've always been terrified of ending up like my parents in any regard, particularly this one. 

Any sound advice?
<bot>: I love this woman as much as I know how to love, but still can't shake the terror of failure from my mind.