I moved on with my life over 20 years ago with a bit of crying- the focus on work and my kids- and found a wonderful guy when I wasn't even looking- so Move on with Your life- there are many "fish in the sea" and all sorts- colors, sizes, and mainly- just work on your self and your child- Who, incidentally, since he is male, takes after YOUR father genetically- so the Xchromosome at work- thru you- means, your son has more of your own father's characteristics than the ex's. Will be much easier , perhaps to work with in his maturation!
Good luck- So many options! Wish you the best- It worked for me!