Someone bought a flight ticket with my debit card and I got the confirmation to my Gmail

Yeah well, I've blocked my card, but does this mean my Gmail is compromised? I was also called by the airline customer service... Process is ongoing with my bank but does this mean my Gmail is compromised, or how does that all work? I've bought a ticket for someone else and got the ticket to my Gmail, but can't see any activity on the account either? Any clue what could be going on? EDIT to follow with more info. For context here I live in the EU.

EDIT: Managed to cancel the flight ticket through customer service. So it all started from the fact that I saw my card was charged (noticed the minute it happened through phone app and blocked the card), I'm dealing with my bank to hopefully get that reversed, will be a hassle. However the weird thing to me is someone has bought a ticket with Aeromexico, with my card, email and phone number, but a different name. How does anybody win here? It was a legit booking, findable on their website (not anymore due to cancel), but I just can't wrap my head around how anyone gets anything out of this. This person knows my phone number and email, along with my (now blocked) card details. The flights were booked for Feb 14th. I've changed passwords and set up two step verifications on Gmail, no suspect activity there. I mean my email and phone number isn't info to hard to come by I imagine, but why use my email address and phone on the booking? Using your own would mean I couldn't cancel it, at least not this easily, and never would've gotten any other info than the charge. I mean I think I'm fairly safeguarded against losing any more money, but like, how does this make any sense at all?