'Ever since you started hanging around with X, you've changed.'
It's one of those allegations which seems to get levelled in relationships which are struggling through a rough patch, the insinuation being that the accused isn't who he/she used to be.
The fact of the matter of course is that we do tend to take on the characteristics of the people we spend the most time with.
Socialising with optimists may give you a more half-full view of life, whilst being around those with a fundamentally pessimistic outlook might well drain your own glass.
Most of us have some around us who need to be there whatever the weather, but there's nearly always a ring in your social circle that's more discretionary - people you can choose to spend time with (or not).
I think life would quickly become bland if we opted to fill this ring entirely with 'happy clappers'. But isn't it worth going a little out of your way to benefit from being with those who generally lift your spirits rather than dampen them?
You know who I mean. Why not arrange to catch up with them?