Friends with ex....

I was with my ex 5years (split up in March)- we had our ups and downs like most couples. (I was told a couple of times hed cheated but he always denied it)

We went out for my mates birthday (as his mates and my mates wer all mates so we always went out as a group) had a silly arguement so i ended up going home - (he didnt come home that night) when he came home the next morning he told me it was over, his reason was 'he wants to be single'

I was obviously upset that after 5 years his reason was he wants to be single.

& now i find it really hard cos when my mates go out they invite his mates and him and tbh i really dont feel comfortable going out with him.

My mates dont seem to understand although they have nothing to do with their ex's and never want anything to do with them, but expect me to have something to do with mine.

A few weeks after we split up he was on facebook tagging his '**** buddy' on all his status's rubbing it in my face.

But then when i met up with a guy when we were out and my ex was there they all had ago at me saying i was out of order.

i have now been seeing this guy i met up with while we wer out but my 'friends' always invite my ex out and not this new guy..

any advice?