I agree with the others about seeing someone - your DF might just need to talk it out and get a few things off his chest.

I for one certainly started to re-think things after my failed attempts. I got very scared that maybe this and maybe that - I think it is a normal part of the process and it takes alot to admit that maybe you can't so something that so so many others people do with such easy!

Having children is taken for granted by humans, it is a "thing" we are suppose to do so when it doesn't go according to plan - it causes alot of emotions with it.