How should I have dealt with situation?

I was having a conversation with a guy, and all of sudden he blew me a kiss and then he looked embarrassed ( I 'm not sure why he did that and he has a gf). Then, few minutes later, when his gf came, he started heavily flirting with her in front me ( even his gf felt weird that he was flirting too much with her... show more I was having a conversation with a guy, and all of sudden he blew me a kiss and then he looked embarrassed ( I 'm not sure why he did that and he has a gf). Then, few minutes later, when his gf came, he started heavily flirting with her in front me ( even his gf felt weird that he was flirting too much with her in front of me). I felt uncomfortable, how could I have handled this situation? Why would he do that?
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