<human>: Hi, I've been single for a few months now and have entered the wonderful world of online dating. I recently (two weeks ago) went for cocktails with a girl [24, F] and had a great time, talked, flirted, though the date ended with a cheek kiss. I texted her the day after and asked if she'd like to meet up again to see a film and she said she'd like to and would see what was on in the next couple of weeks. However, then I got radio silence for several days. I then sent her a text asking if she was still up for a film but still got nothing for a couple of days so I figured she actually wasn't interested. 

I ended up meeting up with another girl [22, F] and we had a one night stand (protected of course). Then the first girl texts me again and says she still wants to meet for the film, that she had been ill and apologised for being shit at getting in contact. My question is this: IF we do end up going on another date (I hope we do, though I'm not putting all my hopes and dreams on this) and IF we continue dating, am I obligated to tell her that I had slept with someone else in the between-time?

I'd like to make it clear that I'm not obsessing over whether or not things work out, I'd just like to know what the "right thing to to do" would be in these early dating situations when occasional casual sex happens.

Can you condense the text into three sentences or less?
<bot>: Went on date with girl, had casual sex with another girl a week later as didn't think first girl was interested. Now first girl wants another date. Should I let her know?