{{{{{{{{{{{{{{{{{{Shay}}}}}}}}}}}}}}}}}} Given the situation, I think you did great!
Can I share something that hubby and I have practiced for almost 30 yrs. When the kids were at home, they were taught that our bedroom was indeed our sactuary. They were not allowed to just walk in. They had to knock and then ask if they could come in. We reserved the right to tell them to leave if they didn't knock or they came in with an attitude. You and your girlfriend, if both of you feel the same, could make the same call when you're in your bedroom. Hubby and I practice the same thing now that our nest is empty. Usually, when he goes in the bedroom and lays down, I know he's "crawled into his cave" to resolve whatever is bothering him, so I knock before I come in. It works the other way around, too.
Sometimes, when you feel overwhelmed with anger (a secondary emotion), it helps to beat the heck out of your pillow or something soft that won't hurt you or something else. It's okay to get your anger out as long as you don't cause harm, unless, of course, you beat the stuffing out of a pillow or two. LOL That's okay as long as that pillow doesn't have some kind of value to you or someone else. You get the picture!
Walking or stomping up and down the driveway, if you have one, also dissipates that anger. Don't forget to breath deep so that your body maintains the proper amount of oxygen. Deep, slow breathing helps in any situation when you're stressed out.
I hope you feel better soon, guy.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.