I guess no one responded fast enough to give you advice for yesterday - but how did it go? Of course it's going to be awkward at first. It seems like you have everything mapped out in your mind about why you want this and why it has advantages (like the end date clearly there). As to how you should act - I'd try to act exactly the same way I did previously. I'd even ask myself - would I have called/texted/whatever a few days ago? If the answer is no I wouldn't do it. At least I'd try to do it that way!
I think the fact that this whole thing is making you feel, as you said, "full blown crazy" should tell you that it's probably a bad area for you to be entering if you, as you claim, truly love your spouse/family. If you truly feel as casual about it all as you say, you wouldn't feel this way. You would be more "so what" about it. Honestly, if I were you, I wouldn't pursue it anymore. Get out while the gettin' is good.
You've got a lot of choices. I
Thanks so much for your reply!