Der Geller,
The concept of “bashert” is not a simple matter. When someone gets married is it guarenteed that it their bashert?? If it would, we could throw away Meseches Gitten, chas v’sholom!! People can and do marry others besides their bashert. The concept of bashert is based on the potential one has to be from birth. Who he will actually marries depends largely on what became of him until this point. (Its a gemara, “kahn b’zivvug rishon, kahn b’zivvug sheini”). It is quoted b’shem the Steipler that only two people in all of Lakewood married their “bashert”.
So to answer the question your question, yes, we believe in bashert, it just doesn’t play a realistic role in our marriage decisions.