I have experienced this with my wife. She has been a recreational user for years but an addict for the past 18 months.
Her drug paranoia can almost be as bad as her addiction. She has always been a jealous type but when she is either using or on a bad comedown her paranoia was out of control. She was tracking my phone using my children’s iPads, following me, making up excuses to call me whilst at work, loads more.
She has reduced her usage over the past few weeks and it’s calmed but the main thing to remember is it’s not you at all, do not change your patterns or behaviours. I literally go from home to work and then to the shops, and back. Rest of the time I have my children with me.
It’s seriously hard not to get angry, annoyed and frustrated but I found just ignoring it rather than create confrontation worked better, especially if alcohol was involved aswell (by my wife not me)
Hope that helps.
Stay strong and keep being you. I have allowed it to change who I am and I am now trying to find my way back.
Good luck.