would get back with an ex if they cheated on you, got the chick pregnant dumped you and then wanted you back years later.
if i wanted him back, and could completely forgive him for the wrong he did, and held no resentment whatsoever toward his child, and was equipped to deal with any baby mama drama, and if i COMPLETELY FORGAVE HIM FOR THE WRONG HE DID (this is important)--
if i could answer yes to each of those conditions, ESPECIALLY THE FORGIVING HIM PART, then yes. but if i couldn't say yes to even one of those things, then no. it's time to explore other avenues.