Sometimes what looks like harmless fun can cross a line in a relationship.

When one man’s girlfriend posted a picture of herself wrapped around a motorcyclist during her Italian vacation, he just couldn’t just shrug it off.

That moment ended up costing them their relationship.

Keep reading to find out how it all played out.

AITA for breaking up with my girlfriend for riding a motorcycle with another guy?

My now ex-girlfriend went on a summer trip to Italy with her parents.

While on the trip, she posted a selfie of herself on the back of a motorcycle with her hands wrapped around a guy’s waist.

Immediately, alarm bells go off in his head.

I responded essentially with, “??? Who is that?”

She, of course, downplays the entire thing.

She said she complimented a guy on his bike (she’s into motorcycles and knows a lot about them).

He responded saying he could give her a ride, and she could tell he was being flirty, but she went along with it because she liked motorcycle rides.

According to her, he ended up dropping her off.

But he’s not buying it.

I don’t know if I believe that, but either way, I find it weird to accept a ride from a random guy and put your arms around his waist and all.

She said that she wasn’t trying to hide anything and didn’t do anything shady, because if she was, she wouldn’t have openly posted about it.

So he decides to make the decision for both of them.

I still think that’s a crazy thing to do while having a boyfriend, so I broke up with her.

But I’m considering whether I was being unreasonable.

AITA?

He wasn’t about to stay with someone who made him feel that uncomfortable. And maybe he shouldn’t have to.

Redditors chime in with their thoughts.

Whether or not accepting the ride was the moral thing to do, arms around the waist is standard procedure.

This user thinks he has every right to be suspicious of his girlfriend’s intentions.

If the roles were reversed, his girlfriend might have a thing or two to say about it as well.

Justified or not, ending the relationship is fully his prerogative.

Trust had been broken, and once it’s broken, it can be pretty darn hard to repair.

He wanted to believe she was telling the truth, but her pictures told a different story.

If you thought that was an interesting story, check this one out about a man who created a points system for his inheritance, and a family friend ends up getting almost all of it.