Ben Affleck is feeling the heat when it comes to his split from soon-to-be ex-wife Jennifer Lopez. J.Lo filed for divorce with no attorney and no prenuptial agreement on August 20 — the second anniversary of their second wedding in Georgia. However, according to a source, their lack of legal protection could come back to bite them. “Because there’s no prenup, the divorce, and how smoothly it goes, is going to depend on them playing nice,” a source dished to a news outlet. “Which means Ben’s got no choice but to try and be as civilized with J. Lo as possible.” The source added Affleck is “basic…