I would say no cause u don't do that like u don't date ur friend's ex cause like 1. Ur friend might think that u waited for them to break up n then went straight into r/ship wiz them in short ur friend will think that they broke up bcz of u 2. Ur friend's ex might(it's a might means might not be true) use u as a tool to make ur friend(her ex)jealous n that might hurt ur friendship So in short I would prefer that u don't do that u might roughen up ur friendship wiz ur friend so it's a no go