[ASTalumna06]

There are so many possible answers to your question, but you're not going to get a definite one here.

Maybe they've already taken too many guys.
Maybe they're looking at grades and yours aren't as high as the other guys they bid.
Maybe more of the brothers need to get to know you first.
Maybe there are some of them that just don't like you.
Maybe they think you really want to join another chapter.
Maybe their membership selection is done in stages, and they only bid 5 guys at a time.

I could go on forever. And yes, they could be saying, "We like you, but we're not going to bid you." If this is the case, be happy that they're being this nice. They could just cut you off completely. They could be sending out mass texts, and you just happened to get one.

Or again, maybe they really like you, but they had so many other great guys that they had to make a really hard decision, and by the luck of the draw, you just didn't get a bid.

You can go to every single one of their recruitment events, but it doesn't mean you HAVE to receive an invitation to their chapter. It happens all the time. Don't be so offended if this happens, and find a place where you're accepted.