How to unjoin connecting stitch (created by accidentally joining in the round)

I am making a sweater FLAT on circular needles. I casted on 190 sts and began knitting. To my horror, when I reached what should have been the end of my stitches, I discovered that I had unintentionally joined the stitches in the round (there is a strand about two inches connecting the beginning stitch from the last stitch). How do I unjoin them? Without frogging!!! Please tell me I can do this without frogging. It took forever to cast on these stitches. Thanks.

P.S. I hope the included pics are clear. I’m trying to show that the sections are connected by the lead yarn, not the tail. Tiny thread on giant needles is intentional to make frill per the pattern.

Here are the pics

The strand that joins the 2 edges looks too short to cut in half and weave in the ends. You can tink back along the round until you get to the join if you’d like. That’ll leave the cast on sts intact.

Since you’re at the beginning of a project, it’s worthwhile either doing it this way or starting over. It’s worth it to get it right.

Thanks Salmonmac. Is there any other way other than tinking back 190 sts to the cast on row. I’ve done this once already with this project. I’m about to throw in the towel.

Not that I can think of (other than starting over completely). It’s discouraging, I know. The first row of a pattern is almost invariably a problem for me too. If it’s not one thing it’s another. Take heart. You’re working with a lovely color yarn and I’m sure it’ll be worth the effort.