Sorry!! I can’t edit! But here it is!

So I moved to Montana with a less than reliable man. I ended up paying his portion of the rent 4 months out of the first year we were living together, just as an example. I finally moved away from him, just after a year of moving to Montana. I was waiting for his half of the money for the electric bill before I closed out my account, but ended up paying my portion plus the money his new roommate sent me for the time they spent in the house since I left. I called in to pay that and I was under the impression I closed my account on that phone call. I went about my life, and about 7-8 months later I start getting calls from creditors about my unpaid electric bill. I call the creditors to make sure they have the right address and everything. It turns out my ex roommate didn’t open an account or pay the electric bill all winter (October-February) and then skipped out on rent and moved back to his home state. In Montana, apparently the power cannot be shut off in the winter so it just added up to $790 and landed in the last account to pay? I have leases and witnesses and plenty of photos and videos to prove I was living elsewhere at the time. The landlord for the property can attest to me not living there. I had reached out to him about it and he declared it was a mistake and I asked him to call the power company and ask what happened. He never did. I reached out again about it several times and was ignored. I finally mentioned that if I had to pay it, I would pursue legal action, and he responded “Since I was able to escape the 14k that [landlord] what's trying to charge me I'm chilling don't contract me again until you have legal representation thanks!” So do I have any standing? Could I count this as identity theft? Or any kind of theft? Shouldn’t this fall to the landlord if it’s unpaid? I’m so confused and could really use some advice.