My SO’s past relationships were all no longer than 6 months. 6 months being the longest. He left all of his ex’s realizing they weren’t “for him” (what he told me)

We’ve been together two months (please no rude comments) and have basically fallen for each other so far. But I always get a feeling he will want something better due to his past short relationships.

All of my past relationships were short as well but only because I always got cheated on/left.

Does anyone else get this feeling? Idk just feels horrible