I find it difficult to see how Bisping was supposedly "running away". He was dodging attacks and countering. He landed more strikes than Leben.
He predicted Leben would continue to come straight at him constantly, and his prediction was correct. Leben didn't do anything to correct the situation so Bisping continued the same game plan. If your opponent is letting you pick him apart, why should you change your game plan? Like it was discussed earlier, this isn't like the Nate Quarry vs. Kalib Starnes situation. Quarry wasn't even really hit the entire match, Leben was hit more than Bisping.
Bisping showed great skill and technique, and if Leben would have done anything at all to change his gameplan, Bisping probably would have adjusted, but we don't know since Leben fought the exact same way regardless of how well it was working out for him.