There may be multiple explanations.
Maybe, Scorpio Ascendant and pluto in 1st house, both want control and the on-and-off relationship is the usual way for this personality to transmit more or less consciously that he/she desires to keep control.
South Node in Cancer show emotional comfort in feeling of belonging to another person or group. But there is also found the forgotten wound. South Node is not all good, is also where we might have been deceived or deceivers, you might fear the emotional involvement.
The first thing I observed was that all of the planets are in the Eastern hemisphere which is associated with high independence and personal power. This is very good, is like you have a lot of choices, it is easier for you to influence others than others to influence you.
There is also a possibility that you want that person only until you prove your attractiveness and then, seeing them as a conquered prey, you look for something more challenging. This is immature behaviour because your relationships never develop along with friendship, devotion or emotional intimacy.
Moon with Saturn may be linked to a complicated relationship with mother, a profound and heavy sense of responsibility toward your mother or toward close feminine figures. You may associate women with some kind of burden. Also it show frustration in defining personal boundaries because of some apparently incongruent needs. Stellium in Leo - generous warm-heart, Moon with Saturn - expressing emotions through assuming responsibilities and through material support.
Juno conjunct Neptune in Capricorn may suggest a clouded or distorted perception about partnership and responsibilities in relation and also idealism in this matter. The stellium in Leo shows you have a generous heart, in last degree, it also may be something unusual about how you like to show your affection, you want to be original and/or an exemple to be followed.
Sun|Venus is inconjunct with Moon|Saturn, which looks more promising than opposition, because the meaning of the aspect of inconjunction is adjustment.
Maybe you could try to observe if the bothering at a certain moment is caused only by the person that you just got interested in, or by any other person.
What if someone else would contact you at that moment? Would you feel the same? Maybe you don't want to be bothered by that specific person because you want to have total control about when, where and how things hapen.
Otherwise, if would be your mood for wanting solitude you would not tolerate anyone else's interruption.
North Node in capricorn is a mark for the need of accoplishments and status, so you might feel that a partner may hold you back or may distract you from your purposes and you tend to see parnership as a contract made by your rules. Those rules are not clear yet because your willingness in giving and geting emotional security(Moon) is linked with Saturn (career fulfillment and status) and that usually comes after years and years of work.
Mars in Virgo is gifted with of scrupulously and perseverance in efforts that guarantee advance in any field of activity. The disadvantage is that may use harsh words toward the loved ones.
If there is the mood for solitude, one may look how to step down gracefully, there must be some proper words for the contemplation and creative moments in one's life.