How I can divert my energy towards creative thing??? after breakup...?

I recently had a breakup; me and my EX both are working in the same office due to which I am always aware of what's going on in his life. I am noticing that since breakup-up he is more creative, he has started doing things, which he has never done before. Activities like Gym, aerobics and dance cles. But on the other hand I can’t do all this things. I am always sad and depressed...I have lost 10 kgs weight too...What can I do to divert my energy towards more creative things???