My boyfriend asked me to chase someone else.

There are two possibilities. First, he still likes you, but his feelings are not so deep, and he is afraid of hurting you, so he makes this plan to let you slowly accept others and forget him; Second, he likes you very much, but now he can't protect you and give you the happiness he wants to give you, so he reluctantly hopes that others can give you the happiness he wants to give you, make up for his incompetence, and then win back your heart when he succeeds.