Cheaters can change their spots, but if you're planning to get married to someone, don't brush aside hints (or outright declarations) of previous infidelity without talking to them about it. Even if you believe they've reformed, it's still something that at least warrants a serious conversation.

We all have our mean moments, but it's important to be able to take accountability and apologize when a line is crossed. If your partner is frequently mean to you (or others), but uses the 'Oh, I'm just brutally honest' excuse instead of showing remorse, that doesn't bode well.

For a marriage to last, couples must be on the same page about finances, or at least be able to talk about money. Don't ignore any financial red flags in your relationship — because money problems are the number one cause of marriage stress.

When you're picking your life partner, you should *never* feel like you're settling, and it's a serious red flag if you're only getting married to avoid a breakup.

Sometimes, all you need to know a marriage isn't right is a feeling in your gut — so don't be afraid to listen to your intuition, even if it's telling you something you might not want to hear.

Sex drive is something that ebbs and flows, so it's totally normal for long-term couples to experience dry spells in their sex life. But if you feel a complete lack of sexual chemistry with your partner — and no desire to work through it — you might not really be right for each other.

Getting married doesn't mean that you have to spend 24/7 with your partner — in fact, it's healthy to have some alone time in a relationship — but if you notice that you'd almost always rather be alone than with your partner, that's a sign that you shouldn't get married to them.

Even if you've been with someone for years, there are always new, little things to learn about them — but before getting married, you should still feel, for the most part, that you know your partner inside and out (especially when it comes to something as basic as their middle name).

If you know your friends have your best interests at heart, it's a red flag if all or most of your closest pals have concerns about your relationship — because chances are they know you well enough to know it's not right.

There are many, many things you can compromise on in a relationship, but there are also some very important things — like deciding where to live or whether or not to have kids — that can't really be compromised on, and those things shouldn't be overlooked.

Trust is essential to a relationship, and even if it's seemingly only about the little things, having a partner who's comfortable lying to you is a serious red flag, because all those little lies will erode your trust over time.

When you're married, your spouse should be like your teammate, and you should feel like they're on your side — which means they're willing to stand up for you when you need them to.

Kindness is often an overlooked trait when it comes to finding a partner, but it's incredibly important to be with someone who treats you well. We may be attracted to people who aren't always nice, but that definitely doesn't mean they'll be good partners.

Ultimately, there's no way to guarantee that a marriage will last forever. One thing is for sure, though: if you ignore red flags early on in your relationship, you're only setting yourself up for marital hardship down the line — so don't be afraid to speak up when you see things that give you pause.