Dear Alexy:
Since long distance relationships are difficult to maintain and since she did cheat on a long distance boyfriend, I wouldn’t – if I was you- try to have a relationship with her at all, not a long distance one. Think of friendship only when long distance (including during a visit).
Considering the difficulty in long distance relationships and your anxiety, your overthinking, I would say: Aim at a committed, monogamous relationship with a woman short distance, one you can see in person on a regular basis where you actually live, is my advice.
anita