I don't think she truly believes that - she would probably be surprised to find how much it would upset her if you did have a new girlfriend. It hurt when my husband said he couldn't say anything if I started dating. But I know he's in mlc and that I should take some of the things he says with a grain of salt. He's in pain and I am an easy target for the cause of it (although I admit I made tons of mistakes as a wife.)
On my end I'm combining DB with Light his fire and combined they are showing me where I went wrong in the marriage and what a good marriage might truly look like...I see small but very positive results but who knows about the future... One day at a time!
Hang in there! Yes, us woman can be very confusing...but men are confusing to us too!