It doesn't just have to be about being "in love" with them. I have strong paternal transference for my marriage counselor. For whatever reason, he taps into stuff from childhood for me, like unmet needs and wants. There's a part of me that's like a little kid wanting to be around, to please, to be protected by, and to be cared for by him. Along with that comes fears of abandonment. I also have OCD, so I'm naturally obsessive about people and things.