Does your woman listen to your opinion? Or does she ignore it? This can be a real telltale sign of whether she loves you or not. It doesn't mean she always agrees with your opinion, but as long as she respects and values your thoughts, you can be pretty sure she loves you. Think about it - does she make any big life decisions without running them by you first? Not so she can get your approval, but to hear what your thoughts on the matter are.
This doesn't just entail the life decisions she makes. She'll also respect all of your other opinions, too. As long as you can back it up with why you feel that way. This is the base of all successful relationships - knowing you're both different, but making it work anyway.