Sounds to me like you both do a horrible job of communicating and as a result you both do stupid spiteful things to each other and really just need to talk it out. You need to learn how to argue and how to complain. I'm talking arguing like debate, not arguing like little kids.
It also sounds to me like you do a bad job of exerting your financial contribution in the situation. You pay rent. You pay for gas/electric. Right? If he is seriously leaving the thermostat at 60 degrees, then you need to be clear that you aren't going to pay for it. If you are paying for an even portion of the water and his girlfriend does laundry at your place, then you should tell them you aren't paying for it.
If you try to have a civil discussion about things and it's clear that things aren't going to work, you need to just move out. Why did you move in with the guy in the first place if you think he's a douche bag?
Unless they are in some violation of the lease/rental agreement, then don't bother the apartment manager. It's not his/her fault and it makes you sound like a cry baby. The apartment manager is responsible for the building and it's upkeep. They aren't responsible for mediating fights or telling people that they are idiots.
It also sounds to me like you do a bad job of exerting your financial contribution in the situation. You pay rent. You pay for gas/electric. Right? If he is seriously leaving the thermostat at 60 degrees, then you need to be clear that you aren't going to pay for it. If you are paying for an even portion of the water and his girlfriend does laundry at your place, then you should tell them you aren't paying for it.
If you try to have a civil discussion about things and it's clear that things aren't going to work, you need to just move out. Why did you move in with the guy in the first place if you think he's a douche bag?
Unless they are in some violation of the lease/rental agreement, then don't bother the apartment manager. It's not his/her fault and it makes you sound like a cry baby. The apartment manager is responsible for the building and it's upkeep. They aren't responsible for mediating fights or telling people that they are idiots.