If there is evidence that support this, this is permissible to think in that way. However, without evidence, it is only speculations that have no value. He should ask Allah for forgiveness a lot and to say: la ilaha illa anta subhanaka inni conto mina athaalimeen.

My husband said that something is always bothering him and he doesnt know what his problem is. and he always belief that someone is using witchcraft or sihr on him or maybe someone is using jinn to trouble him is it allowed for a person to think that way

Jinn, Witchcraft, Black Magic and the Evil Eye | February 14, 2014 9:49 pm
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I would like to know if it is permissable to recite – wahdi qalbi waslul sakeemati sadri – if one wants to remove hasad from their heart. If not what are some duas you can recite for that.
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I would like to know if the shaydhaan makes you think that when you’re in the middle of the salaah that you are just showing off you’re salaah to somebody in the room and in my heart i don’t want to show off, what should i do?