The first card of the tarot, the Ten of Cups, suggests that there is a good chance of establishing a lasting relationship with the other person. This is because the card represents the fulfillment and happiness that one gets when one achieves a desired goal. The card also indicates that both people involved worked hard towards the goal. It also suggests that the other person has shown that they are open and willing to commit to the relationship.
The second tarot, The Hanged Man, indicates that there are some hurdles to overcome before a lasting relationship can be established with the other person. This means that both sides must do something to solve problems and overcome difficulties. The card also suggests that one of the main obstacles is the other person's ex-partner. The fact that the ex-partner is still strongly present in the other person's life can cause great problems for the relationship.
Finally, the third card of the tarot, the reversed Six of Wands, indicates that there are important lessons to be learned if the relationship is to be successful. In particular, the card suggests that one should learn to be more open and available with the other person. Also, we should work together to overcome obstacles and problems. Finally, it's important to learn how to handle your ex-partner constructively so that they don't become an obstacle to the relationship.
Bottom line, the chances of having a lasting relationship with someone who has an ex-partner very present in their life depends on both partners' willingness to commit to the relationship and work together to overcome obstacles. Furthermore, it is essential to learn to manage the ex-partner constructively in order to prevent him from becoming an obstacle to the relationship.