3rd party effect

questioning the feeling of being in the wrong place when in a group or social get together, while inadvertently not having a point of reference while the parties chat away like old times, while you sip on your pint and think after 10minutes, this is a bit weird

going out with your boy/girl friend who still sees / communicates with the ex-partner on a regular basis, whilst inadvertently receiving the 3rd party effect when in social outings or arrangements that make you feel like you need not be there