First of all, congratulations on your interest in the Catholic Church and RCIA! That’s great! :):bounce::yup::clapping:
You are correct about your view. This is adultery on both your parts. This is what the Bible says.
“Do not be deceived; neither fornicators nor idolaters nor adulterers nor boy prostitutes* nor sodomitesc 10nor thieves nor the greedy nor drunkards nor slanderers nor robbers will inherit the kingdom of God.” 1 Corinthians 6:-10.
The Pharisees approached and asked, “Is it lawful for a husband to divorce his wife?” They were testing him.a 3He said to them in reply, “What did Moses command you?” 4They replied, “Moses permitted him to write a bill of divorce and dismiss her.”b
5But Jesus told them, “Because of the hardness of your hearts he wrote you this commandment. 6But from the beginning of creation, ‘God made them male and female.c 7For this reason a man shall leave his father and mother [and be joined to his wife],d 8and the two shall become one flesh.’ So they are no longer two but one flesh. **9Therefore what God has joined together, no human being must separate.” ** Mark 10:3-9
The Catechism of the Catholic Church, 2380, 2381:
I know it’s easy to listen to our feelings, but even feelings can be wrong. They are good as guides, but often, I have found our feelings really should not be the only means for decisions.
There have been many times I was convinced I was “in love”. I have felt this way towards someone who was physically abusive of me. I’ve felt “in love” towards some who were already married to somebody else. I have since learned to take into account my feelings but also realize we can have these feelings and sometimes need to fight them in order to do what is right, good to others, and above all, pleasing to God.