Greetings..... thought I'd throw in my 2cents worth, one cent for each of me being a Gemini and all, although for those who know the Craft with Sag Asc. and Aquarius Moon. So there is a strong Philosophic/spiritual bent to this Twin.
Sounds like the ole Conflict of Loyalties Issue to me possibly in both people. Simply Ask him, What are you really loyal to? Your Freedom to do as you please or making a commitment to a loving partner? See what he says?
I'll tell you straight out....... There are only two things a person can really be loyal to.. the Truth or Deception. One is up front and Noble and the other... self explanatory. But in the end it is being loyal to God and wanting to be a better person thorough partici[pating in loving relationships or not. The behavior is pretty evident where a person stands and lives. All the BS they (Geminis) can intellectually come up ( an they are masters at it) is a real litany of reasons. But a commitment scares them as it does a lot of people. They are afraid to be deeply touched and possibly wounded again, like everyone.. Develop a good Coping mechanism and deal with the real issues but that comes with age and, experience and Wisdom. . Without that.. little chance of any successful relationship.
JUST BE a Happy loving person. If he's not..or won't - NEXT!! get my point?