He has been very distant with me?

My boyfriend and I have been together for 3 years. We have had our share of ups and downs but we always managed to work it out. However, recently he has been distancing himself. He does not like his job. He got into a fight with his boss because my boyfriend was hoping to get promoted but his boss would not let him. He has been pretty upset about it and since then it's as if he is not "there". He is irritable. He has been applying for new jobs and he says he needs to get himself sorted as he is not happy there at all. Since the day he has been told he won't get promoted, which in the industry he works for, that's the only way to climb up, he hasn't been attentive that much. He told me the other day that he is sorry that he has been neglecting me. I never actually told him that he neglects me. However, last weekend we got into an argument as I became needy of him and he said that he needs some time for himself. What is it that I should do in order to support him? Does he not love me?