feeling left out

A friend of mine is soon to get married.
tonight was his stag night.
Like many good stag dos, you invite those people you want to make it a good night.
I was not on the list.

Yet my housemate was. My housemate who is in his 60s. My housemate who agreed to have two people here to stay the night from the stag do. I think that is why my housemate got his invite. That and he has known the groom for much longer than I.

So, when my housemate has decided to go away for the weekend, and I thought - excellent house to myslef, and then get told the night before he's gong that people will be staying, from the stag do I'v not been invited to, I was instantly given a range of emotions to play with.
Bitterness / anger / resentment / loss / neglect / ...

Yet I have played perfect host, EVEN WHEN they ALL turn up and play rounds of cards for a few hours downstairs while I try to sleep.
How can I not feel upset? I'm a human being who, while putting on a brave face, have had NOONE to go out with for over two months now. I'm feeling like my life is s lowly dripping away and my mates are all getting with their lives - getting married, buying property, having children - perhas this is the key issue but it was all epitimised by the 6 guys downstairs playing cards.

I'm lonely. tired. upset. an now can't sleep on a night where the clocks go back and I could have been out [would have been out perhaps one lifetime ago]...

I'm impatient with being patient...