Ok what you need to do is ignore him. Yup that's right I said ignore. What I mean by this is that when he next tries to contact you brush him off or don't even reply for a couple of weeks. Then he wil be wondering what you're up to. Then finally contact him but be real brief and make out you're super busy. Say that you'll call him. But don't and wait till he contacts you and wants to see you. You need to make him feel like he could lose you so then he will try to get you.

It is all a matter of perspective.
In your mind, seems like your are a romantic spirit; in his, you're are a convenience, like filling in the blanks. . .
If the pursue in life for you means finding real love, listen to your heart and it will tell you the truth, always! (that's what happened that you wrote for help; your instinct called you) If you're up just for some lust, that's what already arrived.
Remember the old learnings: sex never drives into love; the opposite is true: love brings to the joy of an intimate and lasting relationship.

He only wants to sleep with you and nothing more. Being busy is understandable but your a woman and you have needs as well. Its not right that only his needs are being met (weekends). Its understandable to be busy but by not picking up the phone or talking to you during weekdays is no excuse.

 

He could easily call weeknights before bed or during breaks. Dating is more than sex such as doing other activities.

 

Movies, dates, dinner, or whatever. You should open and clear things up so that this relationship is balanced.

You may better talk to him regarding this before you sleep with him.