It is good to settle the disputes amicably if both the parties like to do so.
Based on you briefing, i am of the opinion that its not advisable to withdraw the suit filed for Maintenance.
if he approaches again with the request for reunion, inform about the case and tell that, you are open for court mediated settlement/reunion. there shall not be any out of court settlement.
Ask him to appear before the Hon'ble court and seek mediation. there you can make him to agree to you conditions referred about.
Which may be like:
1) Reunion happens if you agree in the court to provide monthly maintenance.
2) Both the parties can mutually quantify the amount of maintenance for wife and child.
3) Husband should not have any objection to order for such maintenance.
4) Maintenance Order will be sought to be enforced, if he fails to maintain his wife and son out of his own will.
one these 4 conditions she can request the court to dispose of the maintenance petition. This will work as deterrent to his wayward behavior.
Regards,