I'm hurt and lost also confused

So my so and I have a 2 year son and we are having another baby due in June 24 in 8 months pregnant . N he tells me that he is not happy with me no more he said " I love you... But not happy anymore " I said why ? He said idk people grow apart so I started crying cause I was hurt n we been together for about 4years n now I'm like what do I do I changed my ways on getting jealous n stuff but idk I was away from 2-3weeks and idk he changed idk if I should stay till baby born or just pack up n leave him foreve 💔😢 this hurts a lot 😞☹️😣😔