Suddenly Stranger by Jason Collins

HENLEY:

I wouldn’t have forgotten a man like Noah.
I’ve been straight all my life, until I meet the man who says we’ve dated. Noah says we’ve already met, and worse, he thinks we’re exes. I lost six months of memory in an accident, and I thought I had it all accounted for.
But the more I fall for him, the less I want to uncover the past. I wouldn’t forget a man like him and the way he makes me feel when he’s around. If I find out what broke us up the first time, it might ruin our second chance before it can even take off. I’ve got two options: risk losing Noah, or live a lie.
Noah’s a part of my past I need to remember.

NOAH:

We may have history, but it’s in the past.
My ex is the last person I expect to flirt with me at an afterparty. An accident took all his memories of me, and he thinks we’re strangers. We haven’t spoken since we broke up, so after five years you’d think I wouldn’t give him my number. But I can’t resist finding out if he’s the same man who wasn’t ready to settle down.
I’m feeling sparks all over again, but I still want kids, and I remember our last talk all too well. I’m not over the breakup, but I’m falling for him again, and bringing up the past might ruin it all. I’m not getting my heart broken by the same man twice.
He doesn’t even know this is our second chance.

This is the third book in the Close Quarters series. It can be read as a standalone with no cliffhanger.