There may be a few reasons you haven’t heard back from someone you’ve contacted. One possibility is that they haven’t logged in recently and haven’t had a chance to respond. Another possibility is that they aren’t interested in connecting. We always encourage members to reply, even when they’re not interested but that’s not always the case. Definitely don’t take it personally, this is part of single life. And there’s plenty of LDS fish in the sea so don’t dwell on it — get back out there and make more connections!