Bummed?

My boyfriend has 4 kids, I only knew about one but I just found out in my own about the others. His kids are all small, under 3 and by 3 different women. To be fair, our relationship is fairly new. I make 5 since I’m pregnant 5 weeks and ever since i told him he’s been acting super standoffish. Is it because he’s scared because he has so many? I don’t know what to take from his approach but he did say he had the COVID which I’m not sure if it’s true but yeah. Also he’s 29.

Advice please