Could someone shed a little light on this please?

she doesn't want a relationship with you (if she did she'd be with you, problems or not) but likes your attention enough to keep you on a backburner. your desperation to get with her probably makes her feel better about herself. find somebody that can be there emotionally, whether as a friend or a girlfriend... she's not being a good friend by stringing you along and keeping cloudy boundaries/communication.