What should I do if he is flirting with another girl?

I recently found the guy I like has been talking and flirting with another woman. We are not in a relationship, we have been dating for over 4 months and we connected pretty well. I’m unsure on what I should do because I really like him and but I saw it with my own eyes that he likes that other girl. What should I do? Any advice?
What should I do if he is flirting with another girl?
What should I do if he is flirting with another girl?
Post Opinion