Micro cheating or??

UPDATE * he intentionally did it hoping I would see to hurt my feelings because feelings need to be hurt sometimes for relationships to be woken

That’s what he said

I was going on YouTube to look at a video and I forgot my boyfriends YouTube account was logged into mine. When I first opened it it had a girls YouTube video that said what I eat in a day as a model or whatever and I look to the left and it shows he’s subscribed to her. Then I saw he comments on a few of her stuff. Now he has never sent me red hearts or called me special and rare and unique. It honestly hurt my feelings to know he would publicly address he’s in a relationship yet comment that kind of stuff on this girls YouTube. I also saw he was hearting her “business page” on Facebook her photos too. She’s not too well know, does have a decent 4.41K following or something on YouTube but she lives in the UK literally across the globe from us.. am I just being insecure or what? I haven’t said anything or brought it up to him. I’ve tried in subtle ways but he says I’m being over exaggerating and under exaggerating when I said he doesn’t heart any of my stuff I send but he does for everyone else.