What should I do with my husband who re-establishes contact with women online and by phone, despite his religiosity and promise to stop, which affects my desire to raise my child properly?

A husband conversing with girls online is forbidden due to the potential for fitna (temptation/strife). The wife did well by advising him calmly, and she should continue to do so while supplicating for his guidance. If he does not desist, she may threaten to inform his parents or her guardian, if that would deter him and if no greater harm would result. She can also appeal to his emotions towards her and their son, and tell him that she fears the impact of these sins on the family and the upbringing of their son.