I'm going to assume that this is the same guy from your other thread about text messages? You guys have only been together a short while, no more than three months. Perhaps he wants to take the relationship slow, doesn't want to be taking weekend trips together yet. Especially if he's going to be working the majority of the time he's there. Perhaps he's just worried about finances (who pays for what?) and isn't ready to make that leap yet. My fiance, whom I've been with for 5 years, recently didn't want me going on a business trip with him either. We're trying to save money, and he would be working 12 hours everyday while he was there and we wouldn't get to spend much time together. It was nothing personal; it just didn't make sense.

I think the more important issue here, though, is you lack of self esteem and self worth. You are basing all of your feelings about yourself on feelings that you think others have about you. This is a dangerous road. I've been down it, and let me tell you, what I thought others were thinking about me was usually as far from the case as humanly possible. Are you in therapy at all? If so, have you brought this up to your T? I think this is an area that a T would be able to help you work through. You could also start using positive self affirmations, telling yourself things like "I am a good person and worthy of love." I know there are also self-esteem workbooks and such, but I've never used one myself so can't tell you much about them beyond that they exist.

I think if you work on nurturing yourself and loving and respecting yourself, you will find that you do not depend on the men in your life for positive reassurance as much. It will start coming from within.

Good luck, and remember to take care of yourself!