In need of some mature advice

So my boyfriend is away at a vocational school (4 hours from me) he's 18 and I'm 16 . And he met a lesbian couple there that he really connected with and they wanted him to be the sperm donor to their baby, we'll without telling me any of this till after he did it , he gave them his sperm and I'm not taking about going to a sperm bank , he jacked off into his hand and then let her put it inside her. Should I be upset about this because he's bringing a child into this world who he also wants to be involved in the child's life and I feel betrayed because he didn't talk to me about it . Any opinions ?