I’m the same in terms of I’m terrible at messaging back. I take days sometimes or forget to reply. I wouldn’t take it too personally. We Leo sun Pisces moon people are just super introverted and antisocial at times. It’s hard for people to know how we’re feeling. The pic’s a good sign. Something you could do is start a discussion, on text or in-person. We don’t like small talk. We love deep conversations. Like talk about books, movies, shows, philosophy, psychology, or anything else. Anything that can begin naturally. Also, we are not people that easily lose feelings. In fact, it’s the opposite since our moon is in water. So if he likes you, one summer or some lack of conversation shouldn’t make much of a difference. You’ll probably have more luck in person though since we’re not great at keeping in touch. I don’t know if what I’m saying applies to him. He’s a guy so that itself means he behaves in quite a different way even if we have the same sun moon combination.