Questions About A Pendulum I Just Bought

I just got a pendulum, and I was messing with it last night. When I put it up on my table, the next morning it was somewhere else and I was 100% sure it was next to me.

When I went to sleep, my boyfriend was already sleeping and all a sudden he raised his head up as if something was behind him. Then that same morning, he said he felt like something entered him and let him see a vision which he can't remember now.

But he said something made him look, and when I asked him if he saw something, he said "no". He felt it, and when I asked why he didn't say anything about it last night, he said he couldn't speak, but fell right back to sleep until he was able to tell me.

Now I know people say they (spirits?) aren't dangerous, but what if you already are sensitive to spirits?

I have done alot of evp's with spirits in the past, and they have always came easy from the begining, but I haven't done it in almost 3 yrs.

Is it true that I should say thanks when I'm done using it (pendulum?) so nothing is attached to it? I never asked any spirit to speak to me either, and I am a very religious person.

I know stuff like that can impair my thinking, but did that happen to my boyfriend? He didnt mess with it, and when I was asking him questions, they were just funny things.

So could you give me some advise on it? I really do like it (pendulum) and I'm not putting all my belief in it to mess with my thinking.
Thanks