First time posting here plus i'm on mobile so sorry if i break any rules. TL:DR at the bottom.

Anyway, in January my ling distance gf came over to live with my family and I. I was living in the garage which went from manly man-cave to a cozy room fit for a mature couple. Things were great. Now, I am not a clean freak but i do hate seeing things on the floor and clutter on counters and tables. (I know that's what they are for but i like to keep flat space clear for when i wanna place temporary bigger items on them like amazon packages and what not) I started to notice a lot more mess after a while which i thought was normal since there was now mess coming from two sources instead of one so i was okay with it. Eventually the landlord tells us she wants to remodel the garage so that it is even more livable (only had one window which didn't open, and wants to add an ac) so we moved back into the main house. One thing led to another and now we have an RV for free. An RV is in no way as spacious as a garage so now her clutter which has overwhelmed my small amount of clutter is very intense. Makeup everywhere, fast food trash, and dishes like cups and plates. We both work a lot so there's never a lot of time to tackle the mess. Now the asshole part is that the other day i lashed out at her. It started as a joke that spiraled into a, "most of the trash in here is because of you" type of comment and that really upset her. I feel bad but at the same time, i care about the state of our temp home. So am i the asshole for being mad about it and lashing out that way? 

TL:DR
Gf and i live in a messy home due to how much trash and clutter she can produce. Lashed out at her about it.