You had serious, strong and long romantic feeling in past?
This happens not often. Don't mix with light interests and feelings.
You could to have romantic relations or just a feeling without them in common form.
With serious feeling you feel euphoria, inspiration, compassion, introject the personality of other in your heart. In common, you had the feelings like: friendship, respect, sexual passion (if you were >=14 years).

What types that people had?
sure opinions are not obligate, assumptions are acceptable too

me:
ISFJ, then INFP