The areolar tissue located in the skin binds the outer layers of the skin to the muscles beneath. Areolar tissue is also found in or around mucous membranes, and around blood vessels, nerves, and the organs of the body.
A heart is a symbol of love. A heart shape is a symbol of love and compassion. The heart has long been used as a symbol to refer to the spiritual, emotional, moral, and in the past also intellectual core of a human being.
I would encourage you to consider all of these meanings and associate them to the times the heart symbol appears in your life. Relate these meanings to the situations in your life. Make your own observations. Take the time to think about the deeper meanings involved with your heart sightings.