My friend (aged 46 and married 21 years,) told me a while back that although she cared for her husband, she had never really truly loved him deep down. She had just dated him because her best mate was dating his best mate, and before she knew it, they were engaged, living together, and married with a kid.
15 years into their marriage, (6 years ago,) she met an American guy - 7 years younger and single, who was vibrant, funny, gorgeous, tall, and solvent, and professional. Worked in media/performing arts. She had a brief intense fling with him; about 9 months long. She met him a couple of times a week for lunch, and booked afternoons off work, and rang in sick to spend time with him; going on walks, and trips to parks and stately homes and galleries, and passionate meetings in hotels.
He went back to the states 9 months into their fling - as his work took him back there, and that's where it ended. She had to cut contact with him as she knew it wasn't going to go anywhere, and as she was so besotted and deeply in love with him, it was just too painful to have contact with him.
She said she never goes a day without thinking about him, and said she has never gotten over him, and thinks about contacting him - at least once a week.