How would a boy act out his feelings for his mother when looking at Freuds Oedipal crisis?

I believe that you meant to ask how would a boy
demonstrate his affect to his resentment at his father and feelings for his mother when
looking at Freud's Oedipus complex.

The answer depends on
whether the boy is manifesting positive complex or passive/negative oedipus complex. The
expected manifestations of Oedipus complex among males (according to the earlier
versions from Freud) argue that young boys would want to amorously connect with their
mothers to the point of envying their fathers. When the fathers react to this, the boys
experience phobias and anxieties called psychological castration.  The opposite would
happen with little girls wanting to bond amorously with their fathers, substituting
their mothers and creating penis envy if they do not achieve their
wishes.

In modern days, however, these expected
manifestations have come to a different viewpoint. It is widely accepted and observed
how boys tend to gravitate towards their mothers while girls "the so-called daddy's girl
syndrome" tend to also connect in infancy with their fathers. It may or may not change
through time, but it does not show nearly as much intensity in emotion as Freud would
have expected to find under a controlled environment using specific participants to
prove his hypothesis.