Why does my heart feel like this?

Today I went out for lunch with one of my friends. We've been friends for about 15 years. She knows I have feelings for her, but I know we will only be friends. Part of me is okay with just being friends. I tried keeping my distance from her, but missing her only made me fall deeper for her. When I'm around her nothing else matters but whatever makes her happy. I like just spending time with her. Even if it's just lunch, dinner or a movie spending time with her makes me happy. Even though I know I will only be her friend, how can I stop my heart from loving her so much?
Why does my heart feel like this?
Add Opinion