I think I read somewhere that betta's won't really jump if they like the environment where their living, if u maintain good water quality, good temp. and just nice decor like plants and ornaments they can hide in if stressed. They won't necessarily jump.
Betta's jump in the wild to find better water's to live in.
I left my tank lids off a few time's, well forgot to put them back on, and my betta's did not jump out, they never did try. I take that as a sign that their happy with where they live, there's other sign's than a bubble nest to let u know their happy.