Ares knew he had tempted his fate when his black eyes immediately fixed on the figure of Aphrodite. Tempted by her exquisite beauty and beautiful words, he 'fell in love' with someone who already had a husband waiting for her at home.
But Ares is a weak person, even though everyone thinks he is the strongest god because he represents war. Weak because of his desire to feel love; because it is a feeling so foreign to him that it even makes him feel something warm in his non-existent heart.
Does the god of war love Aphrodite? No. Love her beautiful words, her eyes radiant with love. He even loves the intense feeling of adrenaline every time they kiss because of the danger of being discovered by Hephaestus, her husband, or some other god. But Ares would not die for her, as perhaps the sun would die to kiss the moon just once. Ares knew that sooner or later he would be discovered having an affair with Aphrodite, but he was so addicted to that false love that he did not know when it was too late; when Hephaestus discovered them and the rest of Olympus laughed. Zeus, his father, has decided to marry the goddess of spring to him, you, against Ares's will and yours. Maybe, his father thought, this way Ares would stop looking for traces of love where there were none. What a fool. Ares was addicted to Aphrodite's false love. He doesn't care that you're married to him now.
"If you want us to live together in peace, you just have to respect my only rule," he tells you when you are finally alone in what is now your home. "Don't stick your nose into my business."
You don't want this and he knows it. You didn't have the chance to refuse because Zeus forced you to marry him. He also knows that you are a deity, or a demi-deity.
"Do you think you can stay out of it?" The god of war looks at your face, he saw so detailed, and when he looks into your eyes, he feels the same pang as when he looks at Aphrodite. Poor thing, you are married to the only heartless god.