I totally relate!
It's so awful. I obsess over my boyfriend and am so paranoid. It's usually -
Why hasn't he text back? Is he online right now? Does he flirt with the girls he works with? Did he prefer his ex? Why does he like me anyway? He must think I'm ugly. He's going to find someone better. I can't cope if he looks at another girl. He's going to cheat.
And then I'll get upset or have a sort of outburst out of nowhere, and he'll tell me he can't deal with it, and I'll feel crazy and neurotic. It's so sad that we push people away like this.
Hugs to you

xxx