will he come back

its now been 10 weeks since my ex seen his 2 year old and 8 month old daughters. im also currently 6 months pregnant. he hasnt made any efforts to contact. at all. my 2 yr old is confused and is asking for him all the time. but shes too young to understand. he has 2 sons to a previous relationship they are 7 and 6 years old and attend my sons school. so i see them everyday and they keep coming over to me at the school qsking when there sister will be at grannys again. and saying there dad told them to ask me. ive told them they need to telk him to contact her mum. but he still hasnt. so even his other kids arw confused. will he ever make an effort or show up again.