How do you tell someone you're in love with them without sounding too intense?

I have been seeing a guy for a few months now and in a weeks time I’ll be travelling for over 10 weeks. Before I go I want to tell him how I feel about him, particularly that I’m in love with him. I would like to consider a relationship when I get back but not right now due to the circumstances. I have a feeling he might feel the same way but regardless because I’m leaving for awhile I don’t want to come across as too forthright/pressuring/intense. Any suggestions on how to tell him?