I actually like Plan B a lot. Go into it w/ZERO expectations and do it for yourself and NOT in an attempt to get back BF.
It may cause you to leave BF for good or it may cause you to realize he's the only one for you. Either way, it would be a good distraction and there isn't anything wrong w/you and "the Piscean" hanging out again. If the old flame fires up, so be it.
I like this because you are acting for yourself and not basing what you'll do or not do w/another man on BF.
naej was correct to say that BF won't do anything until he grows a set, so in the meantime, you are free to go and live. If you move on w/out him, it is his loss and not yours.
Remember, you can always love him, but that doesn't mean you'll always be w/him as his "significant other."