That is awesome you are dating someone new. You are positive and healthy about things, so happy for you.
To counter Stella27 above, I actually would not bring up new guy's feelings or anything resembling using him to get your mom to change. I don't think it is a good idea to attempt to change mom's behavior using your new man.
If you want to say something to mom, I would be polite, direct and curt. Just my 2 cents.
Yay to new man!