It is ok to be "hooked" as yoso says but also to reiterate the ever wise Kimchi, STAY GROUNDED. Calls, texts, photos, promises of the future...she likely has this banter going on with two, three, or more guys at one time. Does she offer you sessions on a regular basis where you just pay the house fee? Is she spending off day time with you on the sly? Then you probably have something promising because the latter two are costing her money.
I don't mean to sound jaded or cynical, just realistic.