Definitely. I have noticed as I've gotten older that I've seen a lot of abusive behaviors in my friends' relationships, but it's kind of normalized. My roommate would shout at his boyfriend if he did something that seemingly inconvenienced him (for example dying too much when they were playing co-op Xbox live, or not doing the washing up) and I always thought it was really odd but didn't say anything. He would always say the same phrase, "you're so annoying, Jake" and he would just keep attacking his boyfriend for like 20 minutes at a time. Jake was always totally silent in response. My roommate started trying to get me to abide by his random rules as well, and Jake just said to me "trust me it's just easier to obey". I was like ....? I thought it was really strange that my roommate would be verbally abusive out in the open when you'd expect that to be something you wouldn't want other people to see or hear, so that tells me he thought it was okay to do.

I'm friends with another couple and the girl is insanely jealous and will give her boyfriend the silent treatment for hours at a time, and will always threaten to break up with him when he doesn't do the things she wants him to. it's just classic emotional manipulation techniques and it happens once every few weeks or so.

Early on in my relationship with my ex, I was really jealous when he was with his friends and wouldn't text back for like the whole day. I'd blow up his phone and get really mad about it. Then one day my friend was telling me about how his girlfriend won't stop texting him stuff about being ignored and being mad about it when he was out, so he would just turn his phone off and deal with the fallout when he got back so he could enjoy his day out. I realized right then that he could easily be talking about me! I was like, oh my god, I do that. I'd been doing this for a few months at this point, and it's like a switch flicked in my brain. Instead of being mad about it, I just stopped. I'd say "hey have a great day out with the guys. What do you fancy for dinner when you get back?" and I'd give myself something to distract myself with while he was out so I didn't get mad. Eventually I stopped needing a distraction, and it was fine.