What are the rules of dating at the age of 55? Things seem so different now!

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I met someone on a dating site online and he seems to be a nice guy. One hangup though, he is an entertainer and works on a cruise ship for three months at a time. I haven't actually gone out with him but he is afraid that by the time he returns that I might meet someone else and not be there to get to know him better. I don't feel that I owe him anything since we are not what you could really call an "item." But, there are some good qualities that might be worth holding out for. I also have the opportunity to meet another gentleman who is interested in meeting me. I feel that life is passing me by and that I might miss out if I don't give this new man a chance as well. Remember, the entertainer is going to be away for three months, I am working 40 hours a week and I feel I should be able to go out and date and meet new people. It isn't like I am in an intimate relationship with anyone. Would you date others in a situation like this? Should I go on living my life and if I meet someone I am happy with, forget about waiting around for Mr. Entertainer? I turn 55 in June and I don't feel like I owe anyone anything since I am divorced and single. What do you think?