Come on, be a friend.

[sitifan]

No, seriously, I really need to hear you say it. Come on, be a friend. I don't know. It just got so hard. And she's, yeah, your girl is ... (My bold.)
Source:

https://www.tiktok.com/video/7304525726659693831

What does the expression in bold mean?

 

[Skrej]

She's asking him to speak honestly to her like a good friend would and tell her the truth, instead of responding as a former romantic interest who might try to hedge his response.