Do I continue to pursue a relationship with this guy when I know he has a girlfriend?

Im 23 and I’m very much single. Ive been in relationship with two men who like me a lot but I lost interest in the first one because he has a little temper nothing to worry about though its just that he complains too much to me. The second guy I lost interest because he seemed so childish after a while, his dad treats him like a kid and he doesnt really stand up for himself and is always broke so couldn’t show me a good time. I gave up on dating and decide to just stay single HOWEVER I started talking to this guy, who is about 27 and has a son, a GREAT guy we click! understand each other, have great conversations together. Thing is he is 1000 of miles away and has a girlfriend. He likes me and I love him and he does plan on coming to live where I am at if he gets the job he is trying to land. My question is do I continue to pursue a relationship with this guy when I know he has a girlfriend and lives far away?. Though he plans to come and see me in July.