Long story, sorry.

In high school, I was friends with an exceptionally attractive girl. There was a little tension, but nothing ever happened. We chilled, we talked, we laughed. We got pretty close (hung out almost every day for a few months). We lost touch after high school.

5 years after high school I start dating a girl I had a massive thing for back then. We've been dating for about 3 months when I run into that exceptionally attractive girl at work. She's still very hot. So we start talking, and we're like "Omg we really need to hang out!"

So we made plans to chill. Go to the mall, do some shopping, then whatever. We go to the mall, buy a few things, then get on the bus. I say "Hey we could watch a movie?" and she agrees, so we make our way back to my place. On the way though, we stop in to the liquor store, because what's a movie without booze?

So we get back to my place and I realize "Shit, I'm super hungry. I should order a pizza." So I order a pizza. We're in the living room picking out a movie to watch and I'm like "Look, it's been a long-ass week and I really want to change. You mind if I throw on PJ pants?" She says "No, but that's not fair I'm stuck in jeans!" I say "No problem, I have a ton of PJs."

So I go into the washroom to change, she goes into my room and changes. She comes back out, we sit down on the couch, pour some liquor, eat some pizza, and watch a movie.

Now the plan was originally that my girlfriend would come over later in the evening, as this girl and I didn't plan on chilling all day. The thing was, her plans had fallen though, and it'd been so long since we chilled that it was nice to see her.

So we're sitting on the couch in the dark, watch a movie, drinking liquor, and I hear the door click. I think "Huh my roommate is home already?" and then my girlfriend walks in. I guess I lost track of time, but no biggie, we're watching a movie. So my girlfriend comes in and sorta looks at the couch like "Okay?" and then walks into the bedroom.

Suddenly it all hit me. My girlfriend just walked into an empty apartment, where an attractive girl and guy are sitting on a couch, drinking together and watching a movie. And she's about to walk into my bedroom, where she's going to find this girls pants sitting on my bed.

... And somehow, I talked my way out of this. The craziest part is nothing actually happened. I have no reason to lie now, no one would ever know, but nothing happened. We were really just friends chilling, but through a series of decisions we ended up on what anyone else would look at as a date.

So yeah. That was a pretty goddamn stupid decision, in retrospect. Could've ended a relationship over a (very understandable) misunderstanding.