I don't think this individual can be classed as a friend - for whatever reason he does not wish to spend time with you and has seemingly taken money from you, without the motivation to pay it back, or to apologise and start the process.

As to why he is being like this, it could be the girlfriend, could even deep shame from owing you money - but I feel speculating too much would be unskilful.

I think first I would attempt to initiate an honest conversation with him if possible, and to share how you feel about the situation, then if this does not work, seek out more suitable accommodation and let this individual know you hold no ill will towards them, and wish them them the best, but you are moving on.

Whilst Buddhism is about acceptance in some things, I do not agree with this view that we should put up with unsatisfactory relationships, or be treated poorly in name of your practice or Buddhism. Whilst you should not place your own inner tranquility and happiness on external things (like this individual) if a move would allow you to be in a better place, it may be the best thing in this situation. As for placing your friend with the burden of the rent, one might suggest this is the fruits of his actions, if you have constantly made the effort, and tried to have open talks with him, and he continues to ignore you and shun you then a move should not be unreasonable.

That's what I would do anyway, but I guess it ultimately depends on if you want to stay and show him kindness and compassion whilst this works itself out - but I think that's more a personal choice, than any sort of moral obligation.

I don't think this individual can be classed as a friend - for whatever reason he does not wish to spend time with you and has seemingly taken money from you, without the motivation to pay it back, or to apologies and start the process.

As to why he is being like this, it could be the girlfriend, could even deep shame from owing you money - but I feel speculating too much would be unskilful.

I think first I would attempt to initiate an honest conversation with him if possible, and to share how you feel about the situation, then if this does not work, seek out more suitable accommodation and let this individual know you hold no ill will towards them, and wish them them the best, but you are moving on.

Whilst Buddhism is about acceptance in some things, I do not agree with this view that we should put up with unsatisfactory relationships, or be treated poorly in name of your practice or Buddhism. Whilst you should not place your own inner tranquility and happiness on external things (like this individual) if a move would allow everyone the space to be happier, it may be the best thing in this situation.