Worse case, they're just into something casual - at which point you can decide if you want to kick it label-less, or just kick'em to the curb.
If you are out and about trying new things and making fun memories - outside the sheets - there's a good chance they want to do more than hook-up with you. We were not dating, and I began leaving my ringer on when I went to bed at night, in case you called, because you usually did. Ladies, this can be especially difficult to decipher. A collection of things you left in my apartment, now packed in a Rubbermaid bin at the back of my closet that I cannot bear to part with.