Sperm donor

What do you think of your boyfriend/fiancé being a sperm donor?? A lesbian couple asked my fiancé to be one of their sperm donors when they try to get pregnant in January.. am I crazy for being upset with this?? We don't even have our own kids yet and don't know if we will be able to.. yet they ask him to be a donor.. am I the only one who would be upset?! Like we don't know if we're able to have kids and what if it's my fiancés sperm that gets them pregnant and we end up not be able to have kids together.. I got very upset and very emotional when he told me they asked him this. I need opinions.. 😔

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