Grimlin, I don't think he is embarassed of you or else he would have never introduced you to them in the first place.
How often does he do this going out with the co-worker thing and how does he treat on the days he doesn't? Do you guys do other things together?
Did he do things like this before you put on the weight or is it a new behavior? Maybe you are perceiving him to be embarassed because you're not happy with yourself right now. I know for me, I project how I feel about myself on to my boyfriend. When truth is I think he see's me in a whole lot more flattering light than I see myself in.
When I feel down about something I assume he must think bad of me about it too. And then I can look for things and reasons to back up those insecure , self-doubts in an effort to confirm them.
You have to do one of two things, either start working on getting yourself in the shape that makes you happiest with you - or embrace the shape you are and see yourself as beautiful. Either way you have to start feeling better about yourself.
If its only a rare thing with the co-workers I wouldnt worry about it, it may be his lil time out time and thats okay for both parties in a relationship, as long as he is open to you joining him if you wanted to.
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Defintion of Insanity: doing the same thing over and over again and expecting different results." - Albert Einstein
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