YOU SAID:

If I love him that does not necessarily mean he loves me.

INTO JAPANESE

私は必ずしも彼を愛する彼は私を愛しています。

BACK INTO ENGLISH

I always love him and he loves me.

INTO JAPANESE

私は常に彼を愛して、彼は私を愛しています。

BACK INTO ENGLISH

I will always love him and he loves me.

INTO JAPANESE

私はいつも彼を愛し、彼は私を愛しています。

BACK INTO ENGLISH

I will always love him and he loves me.