Please is it advisable to allow your girlfriend to speak with his ex boyfriend in front of you...

Would you want her to speak with him behind you? If you don't like it, then tell her you don't like it, set boundaries in your relationship, have dos and don'ts for both of you.
You guys need to stop carrying relationships on your head. She's not your wife yet, don't kill yourself with hypertension because of the activities of a girl who's bride price you haven't paid. Smh

thanks for your advise....