<human>: Brief background: met this guy (James) online, messaged for ages but never got round to meeting up. I got sick of this, tried to fade, then he finally scheduled a date - but I ended up accepting a date with the guy who is now my boyfriend (Rory) for the night before, and was blown away, and James in comparison I had no real chemistry with in real life. James obviously felt the opposite way after meeting and got keener, but I kind of did a fade (I know, I'm a bad person) and he seemed to get that and stopped messaging.

I've now been seeing Rory for three months and we're all sickly sweet honeymoon period. Out of the blue I got a very casual message from James, saying it had been ages and how was I doing. There was nothing to outright say no to or point out that I'm happily partnered off now, but not sure if it makes me a total bitch to just ignore him (my gut says it's only polite to reply).

So, should I reply, and if so, what do you think would be a polite way to let him know I'm no longer available?

Give me the gist of the text in a nutshell
<bot>: Went on a date with a guy, faded. He's messaged me months later and I'm happily in a relationship. Do I reply/what do I say?