Is there any possibility of changing a persons behaviour

Patient: Is there any possibility of changing a persons behaviour and negative thoughts . my wife is in such a trouble in notime she becomes arrogant and not allowing me to socialize with my friends or on my work . even though she is a jovial type. These changes are happening only in these 3 months . and she have negative thoughts on everything as she will or will get sick ,as I’ll leave her so on… She is my lovable wife . now she is pregnant too. I just have a fear about it

Doctor: