If you feel that something is wrong then something probably is. Does he act different then he used to before you felt this way. If he is not on time or does not call when he says he is going to, then he may be feeling different.
You'll feel like theres no longer a connection between both of you, and that you may drift apart anytime. He'll start texting/calling you less, and even stop calling you affectionate names/ intimacy.
Does he treat you like a princess does he hold you close and tell you how much he luvs you or is he always busy and rarely lets you know how special you r? If you answered no to the 1st 2 questions and then yes to the last 1 then that sux chances r he probably seeing someone else
We broke up for a year then went back together and now theres another woman in his life