Thoughts on talking to other girls?

Hi guys! I wanted some male insight on what I'm going through right now, but I want to make it clear that I'm in NO WAY restrictive as the title may come off. The situation is a little bit of a long story, but I would really appreciate it if anyone could take a read and let me know what you think.
I didn't know which section to post it in, so I put it in love advice but here's the link:
Loveforum. net/threads/86796-My-BF-is-talking-to-another-girl-and-lying-about-it
(Spaces removed)
I think a male perspective on how to approach this situation would help me A LOT.

Anyone? :)