Question ?

Hey mamas so I’m a first time mom and me and my boyfriend been together for three years now . This is our first baby I’m really scared to see what happens after the baby come because I’ve seen many relationships fall apart once the baby come and I don’t want that to be my case. Everyone is always telling me “y’all not gonna be together once the baby come “ . Is there any other moms that are still with their child’s father? And is the relationship still going good? If not what caused it to fall apart when the baby came ?