You: Hey!
Them: Hey...
You: What's up?
Them: nothing too much.....how about you?
You: Oh, I'm just doing (thisthisandthis)
Them: That's cool...are you excited for school?

Seriously, stop. I don't know what you mean by those "....". Maybe you intended no harm, maybe you did, but what I see when people do "....", it makes me think you don't want to talk to me. Or you have something to say but won't say it.

I have a lot of friends who have a habit of doing that, and honestly, it just kills the conversation for me.

It's the equivalent of literally trailing off your voice while talking to someone.  

I didnt know it bugged people  

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Your beauty should not come from outward adornment, such as braided hair,
gold jewelry and fine clothes. Instead, it should be that of your
inner self, the unfading beauty of a gentle and quiet
spirit which is of great worth in God's sight

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I know what you mean, but I tend to do that a lot. Force of habit. I normally would have put the "..." after "I know what you mean", but I stopped myself. xD

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I had to consciously stop myself from using it too!

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Your beauty should not come from outward adornment, such as braided hair,
gold jewelry and fine clothes. Instead, it should be that of your
inner self, the unfading beauty of a gentle and quiet
spirit which is of great worth in God's sight

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dude i do that ALL the time....for breaks in my sentences....idk it is easier then pressing a period butten then pressing the dang space buttin...it is just faster for me

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How is THREE periods easier than pressing one?