You might be surprised. OW may not have the motivation to push him. Consider for a moment that there may come a time that she dumps him. It's very possible. The only motivation for her to push would be to marry him. From your description of her, it sounds as though she likes the attention from OM and she's already dumped him a couple of times already. Right?
Has he approached you with anything yet?
"It is curious that physical courage should be so common in the world and moral courage so rare." -Mark Twain
