Love at first sight doesn't exist, as explained by Garnet in the show. When Steven saw Connie, he was ATTRACTED to her. It wasn't until he SPOKE to her that they both started falling in love. That's kinda the low-key point of the show: to teach people about the reality of romantic attraction. Love takes TIME. And love takes WORK. In recent episodes, Connie and Steven hit a bump, but after talking and working it out, they start to grow close again.