What does it mean when he said that his relationship is complicated?

I met this guy, we are very compatible. I like him. I think he likes me too. He seem shy I had to ask if he has a girlfriend he said its complicated. It took him a year to get her and they have been together for 4 and takimg a break to focus on their study. They go to diff. univ.

Should I not focus on him?
What does it mean when he said that his relationship is complicated?
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