Why do I get butterflies in my stomach when I think of him

Most people who have been in long-term relationships agree on one thing: The beginning is the best.

That's because the start of a new relationship is the honeymoon phase — the period in which you're absolutely intoxicated by the other person. But in many cases, the honeymoon ends and the spark burns out after a few weeks. As a result, new relationships don't always survive.

Relationship expert Talia Goldstein, CEO of white-glove matchmaking service Three Day Rule, told INSIDER that there are three key signs that a new relationship will actually last.

Here's how you can tell if your fling will go the distance. 

1. You don't get butterflies when you think about the other person.

A lot of people think that getting "butterflies" — that sinking feeling in their stomach — is a good sign, especially when it's about a new person they're dating.

But, according to Goldstein, feeling nauseous at the very thought of the person you're dating after a while could signal troubles to come.

"People feel like butterflies are a good thing, but if you still have butterflies [after the first few dates], I think that's not a good thing," Goldstein said. "Sometimes it means that there's anxiety or that you're unsure of a situation."

So if you're not getting that fluttery feeling in your stomach, that's a sign your new relationship may actually be the real thing.

"A good match is somebody that makes you feel calm and comfortable," Goldstein said.

2. Time flies when you're together.

It's normal to want to spend all your time with the new person you're dating at the beginning.

But it's important that the time you spend together seems to go by really quickly.

If time seems to lag, or you're counting down the minutes until your dinner date ends, that could be a sign your new relationship won't last too long.

"Good matches are people you have good conversation with, and time flies," Goldstein explained. "At the end of the day, you're with this person for a really long time, and you have to have enough to talk about."

New relationships are more likely to last not only if you can't get enough of the other person, but also if you feel like your time together goes by in the blink of an eye.

3. You have a ton of things in common.

For a relationship to last, it's not vital to date someone who's exactly like you. But it is important for you two to have a lot of common interests, according to Goldstein.

That way, you're more likely to do activities together — like going to sporting events or checking out a concert you're both excited about.

It also means that your conversations will flow, your time together will feel more effortless, and you're less likely to get bored with one another.

"If you're fishing for things to have in common, it's typically not a good sign," the matchmaker said. "Ideally you just happen to have things in common with each other, and it feels like a good fit."

One way to tell that you don't have much in common is if your conversations seem to only revolve around work, Goldstein added.

"A lot of people go on dates and talk about their jobs too much. You're not the best match if that's all you have in common," she said.

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