Why am I feeling this?

Tweet

I was feeling stressed and depressed lately. The reason behind it is still unknown to me. Two weeks ago, my colleague took a long sick leave, for she has to undergo operation. I was delegated to take some of her tasks. These past few days, my friend and my long-time crush are getting inclined with each other. It was my friend who took the first move actually. She sent an email to the guy and since then, they started exchanging emails and SMS'. It was me who introduced the guy to my friend. It never entered my mind that the guy would spent such time with my friend because I thought that his standards are high. I can really say that my friend is not an ideal girl (standard which is known to me). She is really not so smart. I don't know if guys today really into such qualification. But since the guy really is a good looking, I believed that he would not take an interest with my friend. But to my dismay (I think I really like the guy), they become friends and sometimes my friend would tell me their conversations. To cut the story short, they seem to developed feelings to each other and sometimes it made me jealous. But sometimes too, it made me care not. Last Friday, the guy asked my friend if she would like to ride with him going home. My friend begged me to go with them, of course I said no but the guy also begged me. I sit at the back while I asked my friend to sit beside the guy. Then most of the conversation was between me and the guy since we talked more about our company and our works since previously, we would directly coordinating. He took us to a dinner and after that, my friend and I took our way back home. The reason I am telling this is for you guys to help me understand and identify the reason why lately, I am feeling so depressed and I find myself having a hard time breathing. Is it because of the workload or because of the jealousy I am feeling towards my friend?