entering a relationship with mistrust is not a good move, #1 he'll sense the mistrust and feel hurt and if he is being prejudged for something he wouldn't do, you might force him into not being open and honest with you from the outset. (relationship fails within 6 months because you feel he does not trust you) and why should he? you dont so him any trust #2 A relationship is about learning about each other, that includes learning about personal matters and allowing your feeling to grow strong, if you begin with ill feelings from the outset, you are best not entering a relationship in the first place as this will save you both pain and guilt later.
I agree with samantha pia , if you have no trust from the onset, it does not get better. If you can't trust him then your relationship is doomed from the beginning. If you are looking for a long term thing than look elsewhere because with your mistrust, it will be a matter of time before he gets tired of the jealousy and moves on. If you are just in the relationship for fun and a good time than as long as you both agree it is going no where, have fun. Without trust, a relationship is doomed. I dated a girl who was jealous as heck and the sex was great so I hung on for two years. I finally got tired of the crap and moved on. I have been with my wife for 9 years and she is not the jealous type and we have a great relationship. Decide what you want and than decide what you are going to do to get there.