Hold on! That's the only acceptable ending for me.His ex's daughter is too old to be his so technically he can play at winning her over and turning her into his new young wife. That would be the ultimate revenge for his ex leaving him.
I probably shouldn't put too much stock in specific wording, but I noticed last chapter the friend said mc lost motivation "after they broke up" and not "after she dumped him." He seems like the type who would bluntly say it if they did, so now I'm curious what the actual circumstances behind their breakup