Robert Sternberg’s Triangular Theory of Love.
1. Help them out with something. The easiest way to show somebody that you care about them is to help them out with something. If they bring up a problem that they are facing, you could try being there to listen or talk to them. If they say they have homework, job, or test that they have to do or prepare for, you could ask them if they’d need any hand. Hopefully, they’ll say yes. If they say no, try helping them another way. For example, offering to drive them to work or school or get them groceries.
2. Ask about their day. Drop by to say ‘hello,’ leave a message in their email, Facebook, or phone. Ask how they are doing and what their plans are for the day etc? If they say ‘no plans’ ask if they’d like to go eat or do something later in the evening. If they say they have a plan, ask what the plan is and if you could tag along.
3. Remember Important Days. For example, remember your anniversaries, the birth dates or their graduation date. If they say they have an exam coming up on this day, try to offer assistance or be really quiet when they are studying. By paying attention to days that are important to them will show that you care.