Help?!

I’ve had sex w/ my bf about 4-5 times and each time, He only cums & I don’t, after sex he always ask me if I cum and I say no & the look on his face makes me feel so bad cause he looks disappointed, I always make sure to let him know that the sex we have feels good and that I like it because I actually do and I don’t want him to feel discouraged. What are some ways that can help this situation? Any sex tips?