Is OTHER wrong in the post ? POST : My  partner ("P") has a friend ("F") and they have been friends for a long time, and are very close.  F has a history of depression and anxiety.  When P and I first started living  together, F moved in also, and all three of us lived together for a few years.

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Whilst  we living together, F was self destructive in terms of personal relationships, work and general selfcare.  F would come to us for advice and help, which we would give but F would often ignore the advice and do the complete opposite.  

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Eventually,  F found someone who seemed right ("N") and things calmed down a bit.  After a while F and N decided to move across country on a short term basis. P and I supported this, and we found a place of  our own.

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After  6 months they moved back.  Things seemed a bit weird and F  told us about the abusive nature of their relationship.  One night things blew up resulting in the police being called.  We helped F navigate the police issues and cut off all contact with N. 

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This  happened months ago, and slowly it has been coming out F and N have  still been seeing each other behind everyone's backs.  F recently had a breakdown and F's parents were considering hospitalising F.  Although F had issues when we were living together, this new wave is a lot worse than what we have  ever seen.

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Throughout  this time, F has been regularly been asking me and P for advice/help, and we were more than happy to help.  Slowly I have become less  tolerant as F again ignores advice.  Whenever F needs anyting, P will drop  everything to help. Because of F's relationship issues, F gets upset  whenever P and I talk about our plans for the future (or any of our  friends who are in long term relationships for that matter).

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F  is always grateful for out help.  F has acknowledged  they have made bad decisions and say they are trying to get things back  on track.

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F  also stays at our house a few nights each week.  It started with F  asking for permission, but slowly over time it seems more F is telling  us they are staying over rather than asking. Our new place is far  smaller than our shared place, and only has room for two. Most of my things I need for work  (I work from home some days) are kept in the room F sleeps in.  F will  regularly sleep in past 11, meaning I need to get everything I need the  night before or do without until F wakes up.  

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I am frustrated our advice is being ignored and feel we  are being taken advantage of.  I feel a lot of F's issues are because  they have made bad choices for a long time, and this all is a result of a  situation they have created.  I have told P this, and P mostly agrees with me but wants to support F still.  It is starting to put a  strain on our relationship as I resent F's behaviour and taking a  lot of energy away from each of us.

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Am I the asshole for resenting F even though it is a result of mental health issues?