It's not a matter of them being into you. If they're seeing you outside of work and texting you etc, obviously they're into you on some level. I've been with girls who stopped working while dating and guess what happens after that? They're looking to move in with you and be taken care of. It's not a matter of them being genuine, loyal or a nice person. Their intentions might be genuine but at the end of the day, like all other relationships, they're looking for something.
To the OP.. If you're just looking for free pussy, cash in and have fun! If you're single, even better.