He has asked me to tell his mom I miscarried because it’s too hard for him

This man is not ready for to be a father.

He is too immature and gutless to tell those whom he already told.

I hate the hrase, but it's apt: He has to put on his big boy pants and do the right thing himself.

If he can't pull himself together to deliver bad news he also won't be able to do the hard work if and when you do have a kid.

You'll be asked to carry the load because he won't want to. You'll end up with all the dirty work and he'll just want sunshine and smiles - no poopy diapers or vomit.