Boyfriend of 7 months no longer mentions future should I be worried?

We have had several small argument I would say in the past few months. I get over them quickly and feel like we've resolved them but I'm thinking he doesn't feel that way. Around 4 or 5 months he told me he thought our relationship was too good to be true at times but he just pushes the thoughts away, he was in a long-term relationship with a mean woman before me, and he was just waiting a certain amount of time to hit milestones. Now when I bring up the future he cracks jokes or changes a subject. Has he changed his mind about me and just won't say it?