I know I shouldn't set rules my date but I'm losing interest in him because he likes other girls' pics?

I know it's normal for him to talk to other girls since he doesn't my boyfriend yet, but seeing this still makes me lose interest to him. That's why I can't be clear with him, sometimes I love him, sometimes I'm indifferent and he thinks I'm not taking him seriously because I'm unstable. What should I do, should I tell him clearly or do I have to get used to it?

I know I shouldn't set rules my date but I'm losing interest in him because he likes other girls' pics?
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