Ds1 is 21yo it's none of my business, there's nothing I can do, I won't do anything, but let me talk it out here?
He has a GF. They've been together a year and he is absolutely smitten still. They were very serious very quickly and have stayed that way. DS doesn't really see his friends anymore. I've tried to encourage him to keep old friendships up, but he's not listening.
He is always at GF's beck and call. For example this evening he has picked her up from work, spent an hour with her, now she's going out with her best friend (who happens to be male) and DS will collect her later to spend the night here.
He always seems to be waiting for little snippets of time she can give him.
It seems a very odd arrangement to me, but "she's allowed friends you know." Yes she is, but so are you and yet you don't see them because you're always waiting for her to summon you fit you in. (Obviously I don't say this)
Plus he genuinely doesn't seem to mind that she's spending the evening with another man or that he's not invited to join them or maybe he does and that's why he's going to (insisting on?) collect her later.
Obviously I can't say it...I really expected it to fizzle out when they were so intense so quickly, but that hasn't happened.