From Best Friends to Something More: The Second Date

​So, I (28M) have known my best friend (28F) literally since we were kids. She's been like my safe place, someone I could always be myself around without worrying about anything.

​She was in a long term relationship for about 10 years, but they broke up last year. It hit her hard, and I was there for her through all of it. Around the same time, my own relationship ended too. We kind of leaned on each other a lot, hung out more, just like before old times.

​Last night, after work, we went out for dinner and then back to her apartment for a few drinks. One thing led to another we started flirting, then making out... and before I knew it, we ended up having sex.

​When I woke up this morning, I felt this huge wave of guilt. Like... what did I just do? She wasn't acting weird, though. She seemed calm, even a bit affectionate—giving me these soft looks that made it feel like she didn't regret it at all.

​The thing is, I actually enjoyed it. It was honestly one of the best experiences I've had. But at the same time, I can't stop thinking I might've ruined something really important. She's been my best friend for most of my life, and now I don't know what this means for us.

​Should I talk to her about it, or wait and see how she feels first? I really don't...