I was unsure about my relationship of 8 months. A couple I met on a cruise gave me the advice I needed.

• I took a cruise with my then-boyfriend, despite being unsure if he was the one.
• At the cruise, we met an older couple, and they shared their family stories.
• The older lady told me my boyfriend was "the one" for me, and I told him that when we married.

I had been dating my boyfriend Tim for about eight months when we decided to go on vacation together. We chose a cruise to the Bahamas, a place that neither of us had ever been.

I liked Tim a lot — he was sweet, funny, and reliable — but I was starting to feel unsure about the future of our relationship. I just wasn't sure if he was "the one." An international cruise felt like the perfect test for whether we could go the distance, geographically and romantically, too.

The cruise was not all it was cracked up to be

As soon as we boarded the cruise ship, we began noticing strange details. Chipping paint, broken deck chairs, torn sun umbrellas. Above deck, the ride was choppy at best, and people all around us were getting seasick. Below-deck was even worse.

It didn't take long to realize that our cruise ship wasn't the luxury liner it had been billed as. I couldn't help wondering if these bad vibes were a sign. I had been searching for answers, after all. Maybe the universe was trying to tell me something.

We began to enjoy our vacation

On our second night aboard, we were seated with another couple at dinner. Ruth and Paul were originally from the East Coast, but had retired in Florida and were regular cruise-goers. Although Ruth and Paul were well into their eighties, and Tim and I only in our 20s, we became fast friends.

Ruth and Paul were easygoing and funny. We stayed up past midnight playing shuffleboard, drinking daiquiris, and talking about our lives back at home. They spoke fondly about their children and grandchildren, even showing us pictures and telling us silly anecdotes about each family member. Tim and I talked about our own respective families and shared our hopeful plans for the future.

Unfortunately, my seasickness was getting worse by the day. Having used up the small stash of Dramamine I brought, I was nauseous all the time and seemingly out of remedies. One night, while sitting in the audience of an on-board jazz performance, my luck ran out. I whispered to Tim that I was going to be sick, then stood up to make my way back to the room. Tim followed behind me, grabbing the large tip jar off the stage just in time. I threw up into it as the entire audience looked on in horror. Tim held my hair back until I was finished.

My new friend delivered a piece of advice that changed my life forever

I spent the next morning recovering in bed. Tim brought me pancakes and tea from the breakfast buffet. I took small bites and managed to keep them down. By lunchtime, I was finally feeling well enough to rejoin the crowd. Ruth and Paul were incredibly sympathetic. We decided to hit the deck chairs together and relax until dinner.

Ruth took the chair next to mine. We spent the next hour talking just the two of us. That's when I learned that Ruth had been married once before Paul. She explained that her first marriage was short-lived — that it hadn't been right from the start. When I asked her why, her answer surprised me.

"I didn't really know what love was," she confessed. I glanced over at Tim, who was deeply engrossed in conversation with Paul. Ruth caught me staring and nodded wisely.

"Love is a choice," she said. "It's caring for someone in good times and in bad times. It's putting someone else's happiness before your own, and trusting them to do the same for you."

I thought of Tim holding my hair back, bringing me breakfast, and the countless other times he had taken care of me in our relationship. It was as if Ruth could read my mind.

"He's the one for you," she whispered, winking in Tim's direction. "Don't let him get away."

I left the cruise with the relationship clarity I had been seeking

The cruise ended a few days later, and the four of us went our separate ways. During the flight home, I reflected on our trip and the advice Ruth had given me. I couldn't believe how simple her words were, and yet, they were so impactful.

Three months later, Tim proposed.

I said yes.

On the morning of our wedding, I wrote Tim a card. In it, I shared the story of Ruth's advice and how meaningful it had been. Later that day, after we had exchanged our vows, he confessed that Paul had given him the same advice about me.

Twelve years and six kids later, we are forever grateful for strangers who became friends, and for words of wisdom that changed our lives forever.