Is this consider cheating!?

Theres this guy ive been involved with for 3 yrs, we are basically like couples. But the only thing is, he doesnt want to be official. He claims hes very committing to me even if we arent official. He also told me many times that im basically his gf, but to other ppl, he told them hes only talking to me more than friends. Ive asked him a couple times for us to be officially dating, but he refused. His excuses are, we dont need a title. Or living like this is better, cause what if it doesnt work out? Or tell me to let time do its thing, go w the flow. I got tired of asking if i can be his gf, so i am just going w the flow now until hes ready to be official. Anyways, i met this guy at work, hes very mature, and seems very respectful. He told me hes interested in me, but i say for us to just be coworkers. He bought me lunch for work, so i decided to give him my homemade food that i cook from home. And he loves it. Im feeling guilty for doing this, cause even though my so call man, isnt officially mine, he wouldnt like me doing that to another man. But at the same time, we arent even official. Is what im doing cheating?