Respect and love go hand in hand. If a man respects you, he will treat you well. One way to tell if he (or anyone) respect you, is they will tell you about certain problems they are having, and ask for your opinion.
One day he may be having a conflict with his boss. Let's say he is facing ethical dilemmas at work and isn't sure what to do. If he shares this with you, consider this a high honor. Many guys will often try to deal with difficult situations on their own, because they interpret this as being weak. But a man who truly thinks you are wise will greatly appreciate spilling his situation to you, to get a females perspective.
Respecting your opinion doesn't just have to be with work problems. It can also be advise on what to buy his mother, what to wear to your friend's birthday party. If a man asks your opinion-- he cares about what you think of him.