Ex Roommate Thinks They Are Entitled to 100% of Their Security Deposit

This question is from the state of, Oregon.

My ex roommate was still on the lease and moved out. He left his room in apparent bad condition with stains and black marks on the walls. The new roommate paid him his full deposit which was stupid, because the place was messed up and that he shouldn't pay the full deposit I felt.

I then eventually had to pay the new roommates deposit back when he moved out, in full.

Now that i moved out, we got our deposit back, and they took some money out obviously for move out fees.

My Ex roommate whom was still on the lease, had to pay and additional deposit for bad credit when we first moved in, so he expect that to paid to him in full.

When i got the money, i told him he was responsible for half of the move out fees because he was still on the lease, and also that he left his room / house in bad condition when he left after 5 months.
He feels like I should pay him his full additional deposit back, without him paying any move out fees or anything.

I feel like I shouldn't be responsible for 100% of the move out fees, because he left the house in poor condition, and also he was still on the lease, and just left me to clean / be responsible for the house and everything when I moved out, and didn't offer to help or anything.

Am i entitled to take a portion out of his additional deposit because he left the house/ his bedroom in poor condition when he moved out?

If you can work this out with your roommate, get the agreement in writing, signed and dated, and follow your agreement. If not, your roommate can sue you in small claims court.

If you are stating that something your ex-roommate did caused damage that in turn caused your landlord to reduce the refunded deposit, then it's reasonable to attribute that charge to your ex-roommate. If you are stating that you're charging an arbitrary fee because you or somebody else had to clean up his room many months ago, but with no reduction of or effect on the deposit, that's going to be a much harder case to make.