I can’t cope with it

My partner has a low sperm count and low morphology and I just don’t know how to cope with it

The doctor told him it’s because of his weight, he told her that he’d work on it and he hasn’t, he hasn’t lost anything in 6 months... I guess he just doesn’t want a baby as much as I do

I really don’t know what to say to him to get him to understand that it really is him losing weight or it’s ivf, which he doesn’t want to spend the money on