That’s not a question I'll answer in the way you’re hoping for.
That's because it's a question YOU will benefit from exploring, with full commitment and involvement—it doesn't serve you to ask me, without doing your own work.
We have to do our own personal growth work, in order for our lives to be meaningful; discovering the identity of your son's father is one of those deep, karmic lessons that you will benefit hugely from exploring.
This information will also be VITALLY important for your son. It interests me that the word vitally came up—as it important to life, important to the life force. Your son will need this information, whether or not he every knows or has a relationship with his father. He just needs to know.
It feels that it would be of great benefit for you to seek to learn who the father is, not only for your own healing and for learning any karmic lessons that have come from this union, but so that your child may know who is father is; this will be vital to your child’s development, no matter what kind of “father” his father is.