Why do guys ghost girls?

Like I’ve had so many encounters and honestly all the times I have experienced this, I’m usually left heartbroken.
These are people that praise me during the first few weeks or months of meeting me. At this point, I’m beginning to think it’s spiritual. This last experience makes me want to even kill myself, I’m tired honestly, like they ghost with literally no reason, and sometimes when I try to reach out, I notice from the conversation that this person is tolerating just speaking to me. I have reviewed all my experiences and I can’t even point out one of the things I did wrong. If I don’t like a guy that is asking me out, I tell them.
I just hope I don’t become the demon I’m not supposed to be.