<human>: I'm 20's/f. My fiance is 30's/m. 

Long story short: We met online around 2 years ago. Decide to meet, sparks fly. We're an item. We see each other every month or two and are about 1500 miles apart. I find out several months ago he's been having another relationship with an ex. And substance abuse problems. I'm devastated.

He cut contact with the ex, went to rehab, and I can honestly say I'm really glad that I gave him another chance. He has taken this so seriously, and really done so much to repair things. Our relationship is actually stronger than I could imagine, and I'm beginning to rebuild some of the trust. 

The problem here is that I'm going this weekend to meet his family. I was effectively the other woman even though he was dating me before he started seeing her again. She was the one who lived nearby, so she was the one his mother saw, they shared mutual friends, etc. What he did was incredibly shitty, I am well aware. 

His mother knows what's happened, and she and I have talked some and email back and forth occasionally. I'm just really nervous this is going to be awkward. I'm meeting his mom, aunts, uncles, cousins, the whole shebang. What am I supposed to say if someone in his family asks "Oh, how long have you been together?" I don't want to embarrass either of us any more than necessary.

 I want his family to like me. It's the nervousness of meeting your SO's family times 100. I don't want to be humiliated or made fun of. He assures me that everything will be okay. 

Any advice on how to handle this? I can't make light of the situation because it was very hurtful and I don't really want to laugh it off, but I don't want it to be this thing hanging over my head the entire trip either. Should I just prepare for an awkward time?

Can you provide a brief overview of the text?
<bot>: Meeting fiance's family after he cheated on me. They knew her since we're long distance and they dated when he was younger. Not sure how to make less awkward.