Sperm donation

My husbands long time friend just recently asked if he could be a sperm donor for her (she is a single mom). We are currently ttc our second child. I'm not sure how to feel. It hurt that he seemed more into donating to his friend than having another child with me. I want to help her out, but my biggest problem is that she is from his home town so every time we go visit we would see her (also any child if we agree). I would have to see my husbands child when we go visit or just cut ties with that friend and wish them luck. I'm really torn and confused.