Why do some young boys tend to have crushes on their babysitter?

Anonymous
I'm babysitting a 8 year old boy witha crush on me. He constantly tells me I'm pretty and making kissy faces at me. I usually ignore it but lately he tries to hold my hand and kiss me.
I'm not making a big deal out of this. I get the boys have crushes. Its just creeping me out and I don't want his mom getting the wrong idea.
So do I keep ignoring him or tell him I have a boyfriend or what?
Why do some young boys tend to have crushes on their babysitter?
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