First off, let's start with the best way to tell if someone DOESN'T love you. If your partner tries to hold you back from achieving your goals, it's time to get out of that situation as soon as possible. If a man really loves you he will not only support you, he will actively help you get to where you need to be in life. Your happiness is his main priority.
Of course, there are times when your individual goals may clash, but a strong couple will work through this and compromise. A strong couple will take each other's goals just as seriously as their own, so there's no need to worry that you can't progress in the relationship. Like we said, a person who doesn't support you is a massive deal breaker - don't accept anything less than 100 percent.