He might not be ready or have no intention of committing. If he was asked about how he felt about marriage, a "family"(depends on if he still at this stage of his life), and so on, and he blatantly replied in a negative manner, then you know that he has no intention of committing. However, if he is at least willing to give it some thoughts or feels he needs more time, then he shouldn't be pressured. Many men will pull away when the question of marriage pops up. As far as affection is concerned, some men and women alike are just not affectionate.