Husband still in love with his ex/cheating?

Kate

So I'm probably being a bit dramatic about this but it's REALLY got me upset. My husband and I have been together for 12 years, married for 8 years, 2 kids together and both 33. From what I've gathered he was like SUPER in love with his high-school girlfriend when they were together. They broke up and he had several long term relationships after her before we got together. We're kind of from a small town so like she still hung around his friends sometimes and I knew her, but not personally. She quit hanging around his friends pretty quickly when I came into the picture.

Fast forward to tonight and we're playing a game where I got the high score. He goes to put my initials in but puts hers in instead.... Now I will say our first two initials are the same but not our last name (I have his fucking last name) and he used numbers I don't normally use. When I called him out on it, like those aren't my initials, he seemed real uncomfortable and was like, I don't know why I put that, I'm stupid, blah blah playing it off. But then I was like wait a minute, aren't these your exes initials and then he seemed even more uncomfortable and was like I don't know. So I was like I know they are and walked away and he was like are you really mad? It was just a slip up.

BRO WHAT. A slip up? We've been together 12 years, you haven't seen this woman, that I know of, for like 6 years and she's been living in another state. How could you possibly mistake our initials.

Now my crazy ass is convinced he's cheating on me or something because he's been nicer than usual the past couple weeks and even agreed to finally buy me a hot tub. I just thought his depression medicine was starting to work but now this seems suspicious. AND now this man has not come upstairs and I'm pretty sure is sleeping on the couch.

What do you all think? Am I being dramatic? Should I let this go and not be upset?