However, it is important to consider the context. Depending on the situation, you might want to use a different phrase.
For example, if you are trying to say "I am your best friend," you would say "আমি তোমার সেরা বন্ধু" (Ami tomar sera bondhu).
Here are some other possible translations of "are my best" in Bengali:
* আমি তোমার জন্য সবচেয়ে ভালো (Ami tomar jonno shobcheye valo) - I am the best for you.
* আমি তোমার জন্য সবচেয়ে ভালো (Ami tomar jonno shobcheye valo) - I am the best for you.
* আমি তোমার কাছে সবচেয়ে ভালো (Ami tomar kache shobcheye valo) - I am the best to you.
Ultimately, the best translation will depend on the specific context of your sentence.