Why my husband wants a divorce..

After 10 years of marriage, my husband suddenly told me he wants a divorce. It turns out he’s been unhappy for years and wants to focus on his career.I told him we’d sell our house then, but he said it would ruin her financially because our mortgage is too low. He wants us both to stay in this house and BAM! – he’s already dating someone.
“Jessica?” My voice trembled, both from shock and the cold realization of what was happening. She looked as stunned to see me as I was to see her, her expression apologetic yet awkward. “I… I didn’t know how to tell you,” she stammered, her eyes darting between me and the doorway where my husband was likely to appear at any moment.