Not much I can do about this really, but feel like venting. My younger sister - bear in mind we are both in late 40s - has never had what I would call an equal partnership with a man. She would love a DH, family, house, dog but somehow that has never been likely.... 
She has been with T, just the latest of her rel'ships, always people not truly available, for six years now. He is 'separated' but still married 14 years after separation ('catholic so can't get divorced' according to him/her). He lives in another part of the UK, where his (ex)-wife and adult DDs are. In a bedsit my sis has never been to! (Is he with his wife?)
Either my DSis lives in a fantasy world of her own making or she believes his stories. Eg a week ago she was going to Madrid for Xmas. She never has a date or tickets (or else she organises endless 'treats' and he may or may not take part). Always contingent on some problem he has, with work or DDs. Now she is not going to Madrid as T can't make it. She is going down to see him instead for Xmas instead, she says. Somehow I know she will turn up at my parents house at last minute (where my family and DB family will be). She can never ever commit to anything, ever. Her life is on hold for this guy.
One Xmas my sis invited all to hers - T, my parents and my family. An empty chair, we eventually started to eat an hour late, no phone call, sis in tears, what a great xmas that was! She forgave him for that because he 'bottled out' (he is 47 by the way).
I dunno, I don't actively dislike T, I just think they want completely different things and my sis wears a blindfold. I won't have him in my house because that's the only boundary I can set. She calls him 'my partner' and signs her cards from them both. He turns up at some family occasions (weddings, christenings), and forgets to turn up to others. I wonder why he is invited - 'because he makes her happy' my DBs say. But she is unhappy a great deal of the time. She seems to think this is as good as it gets!
She has talked about him finding a job near to her, moving in with her, she scours the estate agents pages, looks at houses - 4 years now - then somehow the only job he can find is local to where he is now.
Aaagh. I get so frustrated with her (we are not close sisters, I try to be kind, I can be a bossy cow though). She is coming round to eat with me tonight - I feel like challenging her on it ie to say you deserve more than this, can't you see you need to dump him (well I wouldn't say that!). She has never dumped anyone.
Right vent over. This isn't unusual is it? What do I do - leave her to it!