Would you be comfortable leaving your home for a month..

I once a friend lodging with me after his wife had kicked him out. I went away for a week with work and came home to find his girlfriend there with him. I don't know how long she had been there. He left the next day and I haven't seen him since. He had left me no food. Soon after, I received a massive phone bill. He had been phoning her mobile from my landline several times a day. Having friends can be overrated.