Why did my boyfriend take his friend's side over mine?

[Anonymous]

I have been dating my boyfriend for approximately five years. He has been friends with said friend for approximately two years. I have been through a lot with my boyfriend and we have managed to get through it all, from a disapproving family to cheating and breaking up and getting back together and we are in a much better place than we ever have been. We are living together for the second year, and last night I got into a fight with his friend. The three of us went out to a putt-putt tournament/bar crawl, and then we went back to mine and my boyfriend's place. My boyfriend went to the bathroom, and his friend started messing with all my stuff. I asked him to stop over and over and even moved my pet into the bedroom to get him to stop messing with him. However, he followed me in there and I had to physically remove him back into the living room. I told him that he was really pissing me off and that he had to leave. He told me that he didn't think so, so I went and got my boyfriend. My boyfriend basically yelled at me and I told him that if he left with this friend, then that I was going to move out and we were breaking up. I have had it with this friend, and this is not the first incident. He told me whatever and left with him, so I took my essentials and am planning on going back sometime next week to get the rest of my belongings. He hasn't even contacted me yet. Why?

Updates

+1 y

in response to some of the answers, cheating is not always the be all, end all of a relationship. Sometimes people make mistakes, and why the f*** would you answer a question if you are just going to be an a**hole? I asked this question because I am unsure of what to do in this situation. I genuinely was looking for some insight to what his mindset was, but if you are going to act like a f** and be unhelpful, then f*** off.

[papercut2]

First of all, being on the cheating side(Yes I'm an arsehole like that), I wouldn't have done it if my heart was taken by the girl I was in a relationship with. I couldn't ever do that to a girl I loved.

Secondly, you don't even have enough balls to use your username, and then you insult us for being honest with you? Seems like you have issues, seriously

His mindset? You were a whiny bitch and he's protecting his friend, who obviously did nothing wrong, he was just trying to be playful with you. You wouldn't have been able to physically removed him(normally) if he was being serious. Friends before crazy bitches, #1 rule

[abzence]

"...and I told him that if he left with this friend, then that I was going to move out and we were breaking up."

So he left with his friend and you have broken up with him and are moving out.

What should he call you about? Asking when you are coming to pick up your stuff?

Or was all you said just empty threats and now you expect him to come crawling for you and you wonder why he isn't doing that?

[Bethys1]

When you are in a relationship- you are a team/pair... He should have your back.. Not take his friend's side. He is being immature.

[phonezoo]

You kind of overreacted to his friend. I think his friend may have been being playful. Also, I think the friend likes you but can't tell you because of your now "ex" boyfriend.

Cheating= end of relationship

parental disapproval=end of relationship

It was over before it ever even got started

[antonlikesmlb]

Because when you give someone an ultimatum, they are going to choose the option you don't want them to.

[papercut2]

If he cheated on you once already, I doubt he cared that much for you