I met this girl sometime ago, she is in her mid 20s and appears to be very innocent too. But over time I discovered she is always very seductive with guys when she is having conversations and all of that. Although she confided in me when some persons made advances and wanted to go on a date with her. I know just her people to an extent, I became disturbed when she kept getting calls from random guys. After which I demanded to know how she handles toasters lol, but she tactical avoided giving answers to the question. There was a time I spied on her which I know was not right and I discovered she gives her phone number to every and any guy who request for it on Facebook, Twitter etc. She even have romantic chat and in some of those chat she will demand that the person stop the chat and call her or send her messages on whatsapp instead.
I even saw one when she was telling the guy not to forget to delete the chat from his phone because she don't want problem with his wife.
Is very painful though, but in my honest opinion I think I should just let go on the other hand I feel like I bother to much. But each time I tell her about it and my fears she talks it down and tell me to remove it from my mind that she can never cheat on me. But I'm just scared shall because I'm a very fragile person in terms of emotions.

Please advice your brother.

Sorry, but you don't deserve to be called a man That's the only thing I have to say

Na wa

Advice on what exactly?

Foodforthought:
Sorry, but you don't deserve to be called a man
That's the only thing I have to say

harsh but true.