Earlier this year her ex from 30 years ago got back in touch. He was her first love and ended their 6 month relationship with greener grass syndrome when they were 18. Their growing friendship which has never been hidden from me - all done out in the open as it were has been mainly conducted through emails. He is primarily seeking a mental connection that he does not find with his wife who attends marriage guidance counselling with him. This has all been OK with me.
And now you're reaping what you sowed there. Big mistake.
So no, you're not being paranoid. You're allowing an open marriage.