Why do some guys feel the need to talk to loads of different girls?

Anonymous
I was talking to this guy, and he kept promising me that he wasn't talking to any other girls like he was me. I found out that he was lying, he started messaging one of my friends. It hurt a little, but I just want to know the thinking behind this.. I tried asking him but got nothing in return.
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+1 y
Just to clarify, I don't /didn't have an issue with him being friends with females. I just don't like the fact that he kept telling me I was the only one but it turns out that there are loads of other girls. I've seen screen shots and he also admitted it. I'm not angry about it, just want to understand.
Why do some guys feel the need to talk to loads of different girls?
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