If your partner feels that there is something going wrong with your relationship (or with some part of your behavior), then they should be a proper person and have a discussion about that with you personally. Going out and talking to other people about it is only going to make things worse for the both of you. The reason why this happens is that first of all, by not talking to you, they are making it possible that you won't even know that the problem exists in the first place.
Secondly, many people would feel bad if they later learned that their partner has been speaking badly of them behind their back. That can serve to tarnish your reputation among your social circle, which is never a good thing to experience. Talk to your partner if they are complaining about the relationship to people around them.