Am I really cheap as my friend said? Pls I really need to know so I can make amends. Thanks.?

I'm 18. I'm a type of person that likes to make friends. I dont really know why I also find people especially guys wanting to be my friend. Sometimes I end up giving them my phone number. So today after school, I and my friends (a guy and a girl) were trecking home when a guy walked up to me and we started talking. I gave him my number when he requested for it....my other two frd took another route since we were not going the same direction. My other friend(the girl) just called me to say Jerry told her that I'm too cheap for talking to a guy on the street. Is it wrong to talk to people and give them phone numbers? Am I really cheap? Thank you! All.