Haven't had a real crush for ages

So basically my boyfriende of 5 months broke up with me just after christmas. (Dw I'm over it, he was awful to me). But since then I haven't had a crush on anyone. I'm bisexual but that was my first relationship. I'm still attracted to people and mildly flirt but I'm not obsessed with anyone. This isn't normal for me as I can't usually go a few weeks without a new obsession but I've been struggling to hold on to people. Is this because of lack of trust from my last relationship or is this normal for people? It's been about 8 months now and I feel lost. Can anyone suggest anything or reassure me?