I think you nailed it on the head yourself - that all the things you’re feeling are for a “squandered past, not a realistic future.”
I’ve struggled with this situation as well, and those feelings never last. The other person feels like an “escape” from your current partner because they are a mystery. I love my SO, but I know all the dirty minutiae of living together for 7 years. He tends to fart loudly in the toilet when he thinks I’m asleep still, and sometimes lets his toenails get too long.
The little details like that don’t give your imagination much leeway, where a prospective life with another person is full of possibilities.
Don’t let this new person be an excuse to throw away your current relationship. It throwing such a huge wrench in your system is indicative of something being amiss in your marriage. Maybe there’s some distance, or needs not being met.
Crushes on other people happen in long term relationships, and are normal, but the response in a healthy relationship is being able to recognize that the lovesickness is fleeting. The bond with the new person isn’t fate: it’s just filling a hole at the moment.
Edit: a good test is this - if the other person had never come back into your life, would you still be happier if you left your wife? If the answer is yes, then perhaps you need to rethink your relationship, but do it alone. Don’t jump to a new one right away without sorting out the baggage from the previous one
You’re very welcome! I think the fact that you’re able to reflect so deeply on this is a really good thing.
Forgive my assumptions, but from what it looks like from the outside, you’ve come a long way down a pretty bumpy road. Lots of people get swept up in these feelings and regret it, but your self awareness is admirable. Sending good vibes and best wishes, whatever path you take