AIBU - DP said that he’d ‘always love his first child more;’ should I leave him?

I (21F) am thinking of breaking up with my DP(27M), because he said that he’d always love his first child, DC(2), more than any other children that will follow.

He justified this by saying that DC was the first that child he had ever raised, and being that he had experienced so many firsts with him, it’s normal that it would be the case. I already am trying to overcome the sense of loss that I feel knowing that my first child would not be his, but hearing what DP said was truly hurtful and makes me question whether or not I should remain in such a relationship.

I have discussed the gripe I feel over the first child experience I won’t share with DP. He tried to reassure me by expressing that it’s not about the event itself, but who you are experiencing the event with, in which our first child would be special because it is a first we experience together. But I can’t help but feel that it isn’t true considering what he said, and I’d hate for any future children I have to deal with favouritism (bio or non-bio). I haven’t told him about how I feel about what he said about DC as I am afraid of the answer being the same.

Other than this, he truly does treat me very well and with a lot of love. He is very patient and understanding of me and the difficulties I face as a neuro-divergent. He never makes neither me nor his DC feel like we are competing for his affection and attention, which I do appreciate. However, the possibility of what he said being a reality makes me hesitant to have children with him and thus I am considering breaking up.

I have the tendency to hyper focus on hurt feelings and overreact as a result, and I would really appreciate some unbiased counsel on this matter from anyone with similar experience (any perspective) on this. Thank you.