I think you are totally within your rights to demand that 1) he consider how you feel about him going off with his friends for a weekend and 2) you two must discuss this at length and come to a mutual decision before you are wed.
My husband and I met on CatholicMatch last December, and were married in June '09. We thought it best that we spend as much time together, and under the guidance of our spiritual directors, I moved to his area to get to know one another before we got married --but not into cohabitation.
For me, it meant leaving behind the friendships and various other relationships I had in my past -- for him, it meant etching out time from his very busy schedule, and consequently surrendering some activities he previously enjoyed. If we were going to become one flesh on our marriage day, we needed to know (in a chaste way) what the other was really like.
In marriage, you have only one best friend here on earth--your spouse. The friendships that you have had up until then helped shape you into who you are, but they led to that moment of marital union, and then begin to diminish. I can truly say that my husband is my best friend, and we do everything together. There is no "my time" and "his time". We are a team--and we work, play, relax best together. If I didn't want to spend all my time with him, I would not have married him, and he will say the same about me. I am responsible for getting him to heaven, just as he is responsible for getting me there--and we cannot really do a very good job of that if we don't spend large amounts of time together.
A Catholic-Christian marriage is truly that two become one flesh. This is not only in the marital embrace, it is in all aspects of life. It is not being "clingy" or "demanding", it is being a spouse. It is part of "settling down". Does it mean that you have "no life"? NO! It means that you share a common life of love and mutual respect--a life lived in union with the other. "One flesh" cannot be divided for long before outside factors begin conquering it. That is not paranoia, it is common sense.