Hi Tammy, and welcome to PC!

I agree marriage counseling is definitely in order to come first before jumping right to divorce, and also the idea that likely more has happened between you two that makes you think of going straight to divorce.

His taking off his ring to have some fun is a huge red flag, and you are wise to bring this to a head. Therapy will either solve your issues or end a bad marriage.

I agree, he may already be unfaithful and you should take precautions to safeguard yourself from possible STDs.