Hmmm...

Background: I'm 22, boyfriend is 30. We've been dating for 6 months. My boyfriend is traditionally very attractive, but definitely has some insecurities and now I've started to notice, jealousy. I'm a bit younger than my boyfriend and I sometimes feel a bit insecure on certain things due to the age difference.

Setting: Last night, my boyfriend and I went to hang out with some friends of his at their house(a couple: M and F late 20's), that I hadn't met before. They aren't best of friends, but friends he sees once every few months or so.

We were hanging out in their backyard, swimming, BBQing, drinking, over all we were having a really good time. We ran out of mixer, so my boyfriend decided to run to the grocery store after a back and forth "no, let me" debate with his friend as my boyfriend is not really a drinker, and sober, he left for 30 mins or so.

I was talking to the girlfriend about common interests and we came upon the topic of injuries from sports. We both had cheered in highschool and were sharing injury stories. I mentioned the only thing that bothers me years later was my Achilles tendon on my left foot. If I do a lot of jumping, and walking it can get sore. Matter of fact, I could feel it right now, just from swimming.

The girlfriend kind of stopped me in my tracks and said how amazing her boyfriend was at foot rubs, and he actually at one time was going to school for massage therapy. That "I totally need to let him give me one" and it would probably help. He kind of nodded his head and agreement and asked if I wanted one. I had just met them and didn't feel entirely comfortable around them yet, so I declined. She laughed and prodded "oh come on", so I said sure, kind of laughing at it.

The boyfriend slid his chair over and I put my feet up on his thigh (right above the knee) and he started to rub my Achilles. All while, me and the girlfriend continued our conversation about injuries. She made a comment to her a boyfriend to "do a good job!" us both kind of laughing it off to him, and he moved from rubbing just the Achilles to kind of a full foot massage of both feet.

Shortly thereafter my boyfriend came back in the midst of this rub, and I could see he was visibly angry. He remained calm but made a comment like "thats enough of that" and it ended and everyone kind of chuckled at it. We left shortly after because my boyfriends attitude had changed, and he kind of rushed us out awkwardly.

I thought he was going to be excited how nice it all went, and that I was really personable with his friends. Nope. Not 10 seconds into the car, he instantly started berating me. He said "I basically partially cheated on him". I was blown away. He railed into a stance that getting a massage of any type, especially a foot massage is cheating if it's not in a professional setting. My boyfriend had an answer for literally every single thing I came up with in defense.

I said it was the girlfriends idea and completely innocent. He said that he's sure his friend likely has a foot fetish, and I quote "they have threesomes and were grooming you".
I said it was all about the Achilles injury. He asked why both of my feet were being rubbed.
I said if it wasn't innocent, why didn't the 3 of us try to scramble and hide it? He asked why the offer for a rub happened while he was gone and not while he was there.

He said that the age difference is why we have different point of views on this. That I'm 22 and still naive. That because of my age, there has been many times in the past couple months where I was oblivious people were making advances/hitting on me. When prodded, he wouldn't give me any examples.

Now that I'm sober and looking back at it. I don't know if the foot fetish or threesome thing is fact, or my boyfriend just being ridiculous, making shit up to defend his stance. Even though I felt like it was innocent, I'm starting to doubt my thoughts on it. I'm not sure if it was innocent in his friends/the girlfriend's view.

We haven't talked about this in depth yet, I woke up and am posting this first thing today after he dropped me off last night.

Am I being naive?

EDIT: Not sure if anyone will see the edit, but thanks to everyone for replying. I definitely can see the general opinion is I fucked up and also need to watch Pulp Fiction.

My boyfriend is either ghosting me or giving me the silent treatment over this whole debacle but I'm pretty sure just from how he shared his thoughts, that we're not really "compatible" and it's over either way.

I had left some minor details out like the fact him berating me lasted 20+ minutes, and any time I spoke, I was basically verbally ran over. I know I fucked up, but his reaction was pretty gross.

Either way, you live and you learn. Thanks reddit.