Like devlish said, drop them both off of your radar. You've already sent the messages, and you can't change that.
In fact, if they do send a message, wait as long as they did to reply. Then just say, "Hey X, sorry for the late reply... this week has been hectic! I'm sure you can relate. let's find a time when we're both free to meet this week or next. what's your schedule like?"
The main point is to only use messaging for meeting up, nothing else.
Now, they feel like they already "have" you. You want to be a little bit harder to "get." They're also thinking, "God, he's messaging me all the time. He must not be seeing any other women. I guess he's not as valuable and as sexy as I had originally thought."
Have you had sex with them? Especially for long-distance girls, it's important to have sex fast. Then when you're lovers and you're not messaging her as much, it's kind of like army husbands that go away for a long time and come back. The girl is constantly thinking of him, wondering what he's doing/thinking. Then wild passion explodes when they get together.
This made me think of words from another post that I think is fantastic:
They're putting you on the back burner. That's the truth. It feels pretty shitty, right? We've all been there. So put them on the back burner. You got dates with these 2 girls, so it should be easy for you to get dates with new girls. Just do the same thing you did to get dates with them, but apply it to new girls that don't put you on the back burner.
