The traits of a narcissist may be more subtle than you think - here are 10 signs you're dating one

Although narcissists or people with NPD can woo you and be charming, they can also turn on a dime, Love said.

"Pay attention to if the person is quick to anger if something doesn't go their way, such as traffic, parking, or reservations," she said. "Plus, look at how they treat others, too. How do they act toward service people — waitstaff, parking attendants, etc.?"

Being a good listener is important in relationships. If your partner makes everything about them, be cautious.

"Does the person seem genuinely interested in you when you talk about your life — or are they quick to tell you about theirs?" Love said.

"See if they ask you follow-up questions or monopolize the conversation," she said.

While everyone may act selfish from time to time, it is a recurrent trait among those who are narcissistic, according to Love.

"They feel entitled to do and say whatever they please — after all, they are the center of the universe," Love said.

"They will spend time and money on what they like, not what you like — but they will make you think they are doing it for you or that they thought you liked it, too — and they will act hurt and disappointed when you protest," she said.

Although it's healthy for you and your partner to have varying opinions on things, if your date can't — and won't — see your point of view, it could be a red flag.

"Determine if they're rigid when it comes to their views on things," Love said. "Also, determine if they're unable to accommodate another point of view."

Some people need admiration more than others, and narcissists fall into the category of needing a lot of it.

"They need to be the center of attention at all times, so they may dominate the conversation with you or with a group," Love said. "Their need for attention and admiration is never-ending."

Although it may seem romantic when a new person you meet is extremely into you, it may also mean they're a narcissist.

"If you think someone you just met is your soulmate, definitely hit the brakes," Love said. "Too often, clients tell me, 'We talked for hours,' 'No one has ever understood me like this person,' etc."

Instead, Love recommends taking it slow when you're dating. That way, you can figure out if someone is truly your soulmate — or a narcissist — or not.

If you're feeling bad about yourself more than good about yourself, and it's due to what your partner is saying to you or how they're acting towards you, they could be a narcissist.

For instance, your partner may insult you non-verbally by rolling their eyes at something you say, but they'll likely insult you verbally, too. If you question their behavior to them, they may say, "You're too sensitive," or, "You're too emotional."

"Oftentimes, the put-down will take the form of teasing, but it is really veiled hostility," Love said. "For example, at a party or dinner with friends, they tell an embarrassing story about you — something you said or did — and everyone laughs, but you feel like crawling under the table."

She said that when you protest, a narcissistic partner could say they're "just teasing," "Why are you getting so upset?" or, "You're too sensitive."

Narcissists also love being in control. If you’re dating one, he or she may want to know your every move or demand a say in what you wear.

"You may think they are being oh-so-in-love with you that they cannot stand to be away from you, but really this is control," Love said.

If you feel your partner is not empathetic, even when you tell them an emotional, heartbreaking story about something personal that has happened to you, this is another sign they may be a narcissist.

"If your partner lacks empathy or an empathic response to something you told them or something you both witnessed, or they're quick to judge, you may have a narcissist on your hands," Love said.