if i don't like them/don't really know them that well, then no because of the aforementioned reasons. (don't want to get involved etc)
if it's a good friend, then i guess it might depend on whether i know the boyfriend/girlfriend. i'd be mainly nervous about getting it wrong and they weren't really cheating or whatever.
but yeah, i'd probably ask my friend whether she would want to know under those circumstances and then tell her depending on her answer? that's the easy way out, they can't get you into trouble if they said they'd want to know.
if i heard about it, rather than saw it myself, i'd actually be more likely to tell my friend. then i can casually mention it in a lighthearted way. like just passing on gossip/rumour. and if she doesn't believe it then neither will i.
if it's a good friend, then i guess it might depend on whether i know the boyfriend/girlfriend. i'd be mainly nervous about getting it wrong and they weren't really cheating or whatever.
but yeah, i'd probably ask my friend whether she would want to know under those circumstances and then tell her depending on her answer? that's the easy way out, they can't get you into trouble if they said they'd want to know.
if i heard about it, rather than saw it myself, i'd actually be more likely to tell my friend. then i can casually mention it in a lighthearted way. like just passing on gossip/rumour. and if she doesn't believe it then neither will i.