I also would like to know what the term "talking to" means. I see it a lot, and wonder if it means "in a relationship with" or "seeing"?
Is he talking to other girls or flirting/sexting/making plans with, etc. other girls?
It's not worth it. If he's lying about it now he won't ever stop. It's stressing you more to be in the relationship it will be to let it go and be stressed and upset for a short period of time.
I've dealt w/ the same thing. Let him know you know nd tell him how it makes you feel. It's completely unfair nd just plain wrong when you're loyal to him nd 6 months pregnant w/ his baby. Guys can be inconsiderate buttholes sometimes. If you feel like you can't get through to him, maybe he needs to hear it from a guy's p.o.v that what he's doing is wrong.