Please advice me

 I am 28years old guy.
 My girlfriend’s mother attracted me with her sexy look and her hot dressing (mini skirts).
 That made me secretly make love affairs with her.
 I had tried to stop having an affair with her but it become very difficult.
 Because she was very hot in bed than her daughter
 and
 she really moans like a bull dozer.

 The problem is that, the woman is now pregnant for me.
 And she doesnt want to abort.
 What should I do?
 Because I still love my girl friend.
 Please advice me.