Do I have a right?

My boyfriend gained his first child after the one night stand girl he had relations with before me threw away the plan b that he got her after their attempt at safe raw sex failed, just so she could disappear and have his baby without his consent and raise the child on her own until the child reached 16 months, where she then felt the need to inform him about his son. Which is considered forced fatherhood because of the no consent. My boyfriend was emotional learning he was robbed of his firstborns life at first but he was a good sport about it and took on the father role like a champ which I admire. But I don’t admire the measures that woman took to get the child therefore I declared I do not like her. At first I felt real sympathy for her but that was until I got the story on her that changed. He thinks I’m cool with everything including her because I only acknowledged the child and never her so because of that he wants me to be involved in the child’s life as a step mom which I like because I love kids. But that would mean meeting the babymama who wants to meet me before I meet her son and that’s a no. Sooo I DON’T want to be in the child’s life because I know I can give the woman a UNINTENTIONALLY bad vibe because I’m a person who CAN’T fake a pleasant expression when around a person I’m NOT a fan of. It makes my eye twitch and my fake smile goes crooked which ruins everything and that ISNT my intention. Which is mainly the reason why I DON’T want to take on the offer to meet the woman and be around her child. I think the child deserves better. So the question is AND PLEASE DONT GO OUT OF TOPIC🙄 Do I as a girlfriend have a right to not be okay with my boyfriend’s babymama even when he pardoned her?

(Since the baby isn’t mines and I haven’t asked for permission from both parents I covered the child) But this is literally my reaction to every mention of the child and this was my planned surprised for the child after learning he love fruit. the child again was nowhere near the issue...

UPDATEE: my apologies if “safe raw sex” is deemed as idiotic it’s not exactly what I live by. That’s just apparently what they refer pullout game as where I reside so I just repeated what I was told. Ty to those who stayed on topic even to those who gave me the tough criticism as well. And gag a dick to the few, Especially these two backwards women “Sie” and “Dajah” who felt disrespected by my retaliation to their degrading take on my character and flip up on my words. It’s not strict criticism it’s disrespect.