When your son cries tell him it is ok to cry, allow him to express his feelings to you and himself. Do not tell him to stop crying or that his feelings are not valid. Everyone, even little kids what to have their feelings validated. If you never allow your son to express his feelings he will never know how to understand everyone else's feelings.
Hug him and show him how to express affection and kindness. You are his first and most powerful person to mimic. If you're kind and giving and allow him to explore how to show kindness your son will be better ready for a life of kindness.
Do not dismiss his feelings. I see dads all the time dismissing their child's feelings, just as their feelings were dismissed out of hand. Moms often go along with this, unsure how to react. Tell your son it's okay, big feelings are normal and it doesn't make you weak or dumb to show them.
Look at your own emotional support. What are you offering to your child? If all I did was show my son how to be what I wanted I would be a pretty bad mommy. Instead we focus together on what makes him gifted as a unique little person.