i had a miscarriage and ever since then the guy i’m seeing has been acting weird, what am i meant to do?

i just can’t wrap my head around any of this because things were great and fine before all of this. i don’t know what to do because i don’t want to press him too hard or make him uncomfortable, but none of what he said before when we thought that i could be pregnant matches his behavior now. i worry he could be under the impression that it wasn’t his because we’ve had conversations about him thinking he may be infertile before, but i find that thought laughable because i like him so much that i couldn’t imagine bothering with anyone else when i’ve got him. i just want things to go back to normal. my birthdays in a few days and i wanted to spend it with him but i don’t even know if he’ll be around by then. is there anything i can do to mend this? why would he act like this if he was ready for the possibility of a baby?