Why is my ex sending me photos of MYSELF?

We broke up April of this year. We have cycles of where we break up and get back together, but during time of no contact, we work on ourselves and grow as individuals. I am wondering why he sent me, two days in a row, photos of myself from when we went on a weekend vacation together. Just wondering what this means. He seems to be a coward and not be able to send me a message, yet will send me random photos. He keeps logging into WhatsApp constantly throughout the day, I’m assuming to check and see if I sent him a message. I just don’t understand. Is he playing games?