What would you do if you caught your husband with a cyber fling?

i discovered that my husband was chatting everynight with this woman for more than 2 months now. he makes him videos, calls him besfriend.. and is being sweet to her. she sends him email every now and then. i don't know if between them is platonic or not, but do i have the right to interfere with them? I am afraid that this friendship would later on fall into love.. was my decision of confronting the woman online the right thing?