Some people are stormy
People bring their own weather into your world. If your personality is normally sunny, yet every time Stacy comes around it becomes dark and rainy, then know the gray clouds have nothing to do with you. When you meet a new person, simply allow yourself to get a feel for their weather. If you like it, then let them into your circle. If you don’t like it, then don’t let them in.
We all have cloudy days and that is okay. The key thing is to notice whether or not the person’s weather is consistently negative. If it is, then you have every right to guard yourself.