Yea, actually I was feeling that way because my new 5 gallon tank. My male betta is in a 2.5 and my female is in the 5 gallon. I felt like he should have more room since he is the first one I got, but I am planning to put some ghost shrimp with the female and maybe a snail, so she'll have about the same room as him. And my male loves his home, he has plenty of space to swim and explore, so he is okay. :)
"Life is an adventure full of beautiful things, and a treasure worth more than gold."