Break Up with Complications

The Background:
My (now) ex-g/f and I bought a house about 7 months ago. For the past few months we have been renting a room to a 'friend' (No rental agreement). About a month ago, my ex-g/f "fell in love" with this 'friend' and broke up with me. A few days after the initial break-up I asked the 'friend' to leave, they didn't leave. A few days later I told the 'friend' that living with us wasn't going to work, they didn't leave. The next day I told the 'friend' they had to leave. They left, sort of. Excuses to return and get things, sneaking back while I was work (I work 3rd shift) and such.

For the next 3 weeks of trying to talk to my ex-g/f to solve issues and the 'friend' not really leaving, I went through emotional and psychological "hell". Finally, I snapped. I was going to kill myself, after 24 hours of no sleep, the last 5 arguing and alcohol involved. I just wanted some questions answered beforehand, so I woke them up at 2am, with a knife in hand. After a some talk and pleas for me just relinquish the knife, the 'friend' and I ended up in a struggle and the 'friend' wound up getting cut on their hand. I had no intention of hurting either one of them (or my daughter in the next room), the knife was solely intended for me.

No police were called, the 'friend' did not go to the hospital, under the agreement that I left and seeked professional help. That is what I'm currently doing.

I should mention that at no time in our relationship was I violent, abusive, do drugs and I don't normally drink. Very light social drinker type if even that much.

My ex-g/f understands I was under stress, I was drunk and 'suicidal' isn't me. I was just driven to a point of snapping.

The past couple days I've been negotiating my return to my house with my ex-g/f. I do have a job to return to after all and both of us want to work on becoming friends because of our daughter. I'm trying to tell her that I can live there peacefully if the 'friend' wasn't at the house at all and the 'friend' being there would just cause hostility that we both don't want around our daughter. She however is wanting the 'friend' there, claiming that it is her house too and me coming back might not be a good idea.

Questions:

1. What can I do about the 'friend'?

2. What can the 'friend' do to me?

3. Did I basically throw any right to be in the house away with my stupidity?

4. What obligations towards the house do I have if she decides she does not want me there?

5. What obligations towards the house does she have if she opts to leave if I go back?

6. 2 months I got a couple cell phones for the 'friend' under my name under the agreement they pay for them. They have 2 year contracts, can I hold the 'friend' responsible for the cancellation fees?

Like I said, this is somewhat complicated. My apologies. Keep in mind, as of now there is no legal actions in the works. No charges, no restraining orders, and such. But answers to any of these questions would be appreciated. I need to know my rights or lack of. Thanks in advance.

first off your daughter is in danger, if the state gets word or her mother or other parents u could possibly lose her because she is considered in harms way,i know this cause im in a similar situation get your daughter out of it you dont need g/f or friend sell the house and split money considering how u all bought it first Take it to court if u have to get u a lawyer but if they place charges on u which would be assault thats not good either lose the friends and i wouldne call them friends if their doing this especially in front of your daughter> Your daughter should be your first priority..