Why are you buddying up to me? I don't even know you.Try to buddy up to him and pretend you are interested in what he is doing.
buddy up to (someone)
To be overly or obnoxiously friendly with someone, often for personal gain. He's clearly buddying up to the teacher so that she'll relent and give him extra credit.The new guy needs to calm down and stop trying so hard to buddy up to us.
buddy up to someone
in. to become very friendly toward someone. Why are you buddying up to me? I don’t even know you.