Guy's Behavior

Guys, Why would you ignore someone you confessed having feelings for and start to flirt with other girls in front of her?

I'm a very insecure person. I know I'm not attractive and I know I'm fat. I'm super needy too. Well, whenever I like someone I never confess out of fear of losing them and how much more that would hurt me mentally. I've been trying to work on that because I have a habit of rejecting people I love because I'm so insecure. Now when someone confesses their feelings for me, I do admit my feelings too because I dont want to lose anyone again. Well this guy I liked confessed to me that he likes me. That, however, opens more doors for me to be insecure. He keeps calling me cute but I know I'm not and I know he is way out of my league. I told him he doesn't have to lie to spare my feelings and he insisted he wasn't. But after telling me all this, he starts to ignore my texts for going between 30 minute and 6 hours in between each reply starting the very next day after telling me he liked me. He also started flirting with other girls in front of me. And this all only started after we confessed we had feelings for each other. I feel like this is his way of trying to express that he is no longer interested without saying it. I've read online some people say he's no longer interested, some say its that he's keeping his options open, some say he's playing mind games. I do ask him but he acts like he doesn't know what I'm talking about. So, I'm just wondering if you just confessed feelings for someone, would this behavior be a sign of disinterest or is it some sort of mind games?
Guys, Why would you ignore someone you confessed having feelings for and start to flirt with other girls in front of her?
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