Crying at the thought of it....

I am not the jealous type, nor am I paranoid about my boyfriend.

My boyfriend and I have been together now 9 months, we are part of this drama group, where we do competitions, in the upcoming perfomance, he has been given the main part and must play a part which involves having got a woman pregnant and a relationship (the other girl got the part because she is actually pregnant and will have a bump by the performance), on finding out, I have felt really emotional, I don't know, I feel like crying every time I think about it, I cry a lot of the time too, I don't even know if it's related to this, I am just wondering is it normal to feel this sense of depression when it comes to your boyfriend acting with someone else romantically?

I mean sometimes I feel, during rehearsals, when they properly start, that I may be pushed out, and not be able to spend as much time with him, as well as not having enough attention from him. I don't know, I am not at all clingy, I just love his company and I trust him 100%%, I know what jealousy is and I don't think I am...

Am I normal for feeling so hurt, depressed over such a small minor thing? And what is it that's getting to me so much...