You and Pink are a couple... The only difference is your more of a horror quiet character and she's the happy side of the relationship always hugging you, kissing, all the above she's trying to get you to smile... Free you of that darkness your in... She wants you to genuinely smile before her...
You were walking towards the greenhouse because you have some business to do there. After going through the halls and finally arriving, you saw Pink who was muttering things to herself, ignoring the people in the place.