please help

Hi I am 21 from the UK, i have been with my partner for the last 4 1/2 years - he is 28.

We met online when I was 17 and I moved 160 miles to live with him after about 3 months, a bit soon I know, bit I didn't care I just wanted to be with him.

Now I am feeling so bored and I really don't want to be with him, I have tried breaking up with him before but he gets so angry I get scared.

I have been in stable job for 3 years where I am living, we have a few financial commitments too plus a rented house.

I stupidly cheated on him last night with another man, as I am currently visiting my parents. I don't feel guilty what so ever. As my man doesn't seem to satisfy me or make me feel loved.

I have spoken to my parents about moving back in, they are a bit dubious about this, I won't be able to afford my own place until I settled in a new job.

I just don't know what to do, i regret moving in with him, but If i leave ill have to leave my job and will lose friends too.

what do i do???????????