This happened to me the exact same way. Couldn't get anyone on board so I bought a plane ticket to Hong Kong by myself randomly one night and it was one of the best trips I've ever taken. I've done a few other solo trips since.

I think the thing I like the most is the sense of ultimate freedom - no arguments or drama, disasters out of your control etc. Everything you do is because you chose to do it. If you make a mistake and screw something up, nobody is going to complain. After being in a relationship for 7 years I really long to get those moments back...