I have been observing relationships for some time now...trying to find what makes a long term relationship work. What I seem to find...is that they rarely do. And the reasons are MANY.
What I have yet to see...is any couple...who left their marriage for another person...and made it work. It almost always ends.
Because...
It is built on sand...not on anything solid...so when the winds and rains come???it is washed away.
I believe that passion is missing in most peoples lives. not the I-want-to-****- passion...i mean Passion from within...finding something in your OWN life that DRIVES you... most people don???t have this in a career, hobby, relationship, etc...So it is sought.
My married friends all look at my life...and they want what I have. Several are doing the exact thing you are. And every time they ask my opinion...I tell them this:
IF you leave...please make sure it is your last resort. Please make sure you have tried everything within your power (counseling, books, time, vacation, etc) to make this work.
I also tell them...please don't leave for another person! If it is THAT bad where you are...fix it...or get out... to be alone. I say, "Leave b/c you would rather be ALONE for the rest of your life...than with the person you are with."
If it's not that bad... then find out WHAT is missing! Talk to your partner about what could bring something back...
And while this is being done... pick a new gym time. Be a MAN... not an idiot.
You be strong and put your foot down. She is married. Period.
Does she have children? Do you? If children are involved...this Lion will rip your head off!!! GRRRRRR
Kidding...sort of. Actually, I???m not here to judge. I've lived a little and found pieces of wisdom. I hope something you read here will give you guidance.
Just my 2 cents...for what 2 pennies are worth...