Pregnancy but complicated relationship!

Hi guys pregnant. My situation is lil complicated. My partner of 5 months has 2 kids from his previous marriage. This is my first pregnancy and to him its just all normal. Nothing special or new. Hes not affectionate or anything different to when i wasnt pregnant. This is affecting me as i expected alot more. The situation is complicated as he doesnt want to divorce his previous wife yet due to finance (its not costing much) which again is making me insecure... should i worry? To add more complications... his been with his ex for 16 years and through that time he has cheated. He has told me all of the details not to scare me but for a fresh start. Can people really change? I do love him alot..

Well an update to my post from 6th dec.

He has now left gone back to his wife and kids. Im left stranded and pregnant. Im totally devastated as he seemed so genuine with me. I dont know what to believe if any of his love was ever real... well merry xmas to me and baby i guess... better to know now than later..