If you don't want to make this yourself, you can find the easy-to-use template here.

In this video tutorial, we will guide you through creating a romantic title sequence featuring Valentine's heart particles using Adobe After Effects.

We’ll be utilizing the Trapcode Particular plugin for this effect. If you don't have the plugin, you can either purchase a template that includes both a plugin and a no-plugin version or create your own from scratch.

To get started, create a new composition in full HD. Begin by designing your background using the Trapcode Particular plugin along with a lens flare effect. Choose your preferred colors from the color gradient options available in the effects menu.

Next, add a new solid layer for your particles and apply the Trapcode Particular effect to it. Customize your particles by adjusting their size and scatter until you achieve the desired look.

For a detailed step-by-step guide on creating and animating these heart particles, check out this video tutorial.