Caught my husband having an affair?

I have been with my husband, I had no suspicions what so ever; and thought that behaviour was in the past. I had a Christmas clear out and found an old laptop. I noticed it was still logged in to my spouses fb, i clicked on it not really thinking much of it. To my horror I found messages to him and another woman dating back years and years. I couldn’t physically read them all, but I read enough in the few hours I did read them. The messages between them were really emotional, and he seems to of ended the relationship a year ago; but has been messaging her on and off since. She tells him she loves him; and he replies that he doesn’t love her but “has feelings” and tells her he loves me and our family. He then sends her love songs which lyrics are that of “I love you” I pulled him up on it and licked him out, after weeks and weeks of him trying to shrug it off as friendship I got the truth. they have slept together twice: and he knew it was wrong and called it off. nothing was planned and he was just out and drunk; that she made the first move and he was just thinking with his dick and not his head. He said as soon as he was done he went home, he said she was just a fantasy and that she means nothin to him. He has blocked her on all platforms, but I’m just curious as to what she really was to him. Was she really as meaningless as he says, I know he told her he didn’t love her, but the love songs where contradictive. We are regularly goin to couples counselling, which he’s struggling with as he dislikes opening up about it, bt I need all the facts before I can make a decision on trying again. She is said to be a girl from his high school, who he was good friends with, he said he cares about her in some small way but she is nothing compared to me and our life together: and it was all one big mistake

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My question is what was she to him? The affair has gone on years emotionally even if they have only had sex twice. She was a female he’s known since high school so there is a lengthy friendship behind it. I just can’t take it at face value that she was meaningless, or that could a guy genuinely take part in this affair if he felt nothing?
Caught my husband having an affair?
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