Two face boyfriend

Natalie • 23 years of age m/ Feb 15 blessing due Jan 2016👣
Hey all well...I know it is not good to do so but once again I look through my bf phone only because his alarm was annoying me and he wouldn't come shut it up. Well we have a baby on the way and he swears up and down he really loves me and IMA be his wife this that and the third. Acting all happy to become a family and to be with me etc. in my face or around me. But when it comes to his phone its a different world. He telling his so called sis to be honest he isn't ready and he think he made a mistake. When we had been trying for a whole year and stopped. I already miscarried back in February with his child and it saddens me that such a blessing happens again and he so called happy around me with his friends via text its a different story and he flirts with his so called home girls all the time and he called his sis sexy saying IMA get you sexy ass to do my hair etc. I really just want to be happy and stress free so I wont harm my baby....there is way more to the story of his 2 faced ness but...What should I do how should I approach him about these situations without stressing myself and baby out???? I dont wanna leave because he wants to actually be in his child's life which is threatened not to happen if I'm not with him but when he talks to some other people oh he think he made a mistake...but asks so happy with me idk I just don't understand please send your thoughts thanks !