Sperm donor 💕

I guess I just need a little support or advice with this 💕
I've wanted children for quite some time now and I spoke to my ex about it a month ago and he said that he would very happily donate his sperm to me so I can have a child ( I am 21 and he is 20) and I have no problem with being a single mother and we have rules and stuff set in place and he would want nothing to do with the child ( which is completely fine by me) has anybody else gone through a similar situation ?Â