<human>: Can you condense the text into a few key points?

My two friends here are sisters and around my age. We've gotten to know each other a lot, and even went to the beach together. I've only known them for 2 months. They are the sweetest, nicest girls I know, and while our friendship is strictly platonic, it is very odd as well. When we hang out in person, like we did this past weekend, it's a blast! We have so much fun laughing and talking together. 
However, via text is a little different. Every now and then we'll get a slightly good convo. But other than that, well, it sucks. It's mostly just pointless BS conversations that end in me making something up to get out of it, forsake of it getting weird or any more irritating. They both message me everyday, good morning, good night, and everything in between. That's the problem. 

So, basically, there's really nothing to talk about much because they ALWAYS message me. The younger sister more so than the other, really. But my dad could tell that the older sister likes me, somehow. He told me this.

Is there any input you guys can give? It's just weird. I really care about them as friends and don't want to ignore them, but I hate when text conversations go stale like they do. Sorry if I've confused you.
<bot>: My two great female friends message me every day, as a result there isn't much to talk about and conversations go stale. But our personal friendship is amazing though.