How do you know when someone is losing interest in you?

Of course, we can know if a friend or a member of family who are no interest with you again, it shows by stopping to talk with us, if we make a call there 's no answer,anyway, he/she will always give any negative action, even one can cut off the relationship with us.

i suppose when they are distancing themselves from you.

They stop calling you.

If your gut feeling tells you they're losing interest then they probably are.  Take control and distance yourself from this person and see what happens, then you'll have your answer.

They blatantly start lying about everything all the time. They make promises, they don't keep. They pretend their busy when you call. 

This question has a very simple answer, its usually when one has to ask a question like this on a website like this. Trust your gut instinct here as youre feeling something amiss here and chances are its your relationship so you have answered your own question here. The rest are only minute side effects of a relationship that is slowly fading away, sorry and good luck but don't give up til you find your Mr Right oneday

If they try to avoid you and make excuses.