How would you feel if your partner was flirting on the internet?

I would definitely not be too happy. I would ask them to stop immediately. Hopefully they would stop. If they had any sense they would stop. If they didn't stop I guess we would be having some problems that would lead eventually to a broken relationship. Flirting can be very destructive in a relationship. I know that it would in any relationship I would be in. No, I don't like flirting at all.

I would look at it as a red flag. I would ask "Am I not good enough for you to flirt with"? I'm re-married now but my ex husband did the exact same thing. At first I ignored it thinking that he must be just playing. Then it became an addiction...to make the long story short because of that we ended up in divorce. Your partner may reason out that it's just for fun..nothing serious...just playing. Here's what you should keep in mind though: It could escalate to something serious...very possibly. Emotional affair is a LOT worse than physical affair. Any partner who will go "Oh it's okay cause he/she respects my privacy too anyway" DOES the same thing. I'll bet my right arm on that. Take care.

He's free to do whatever he likes. I dont own him. I dont pry into his internet activities and I wouldn't expect him to pry into mine.

At first, I would feel sad and "hurt". I would feel that way because then I may not be getting his attention that well. I may not have "satisfied" him for him to look into other directions. But then maybe after much thought, I would feel that would be useless for me to do that. I always been someone who does not want to "force" myself on people. Let it be and let him.