Hello,
This is my first post on here. It's a quite a long one about my partners behaviour. I don't think it's right but need some advice.
I started seeing a guy last year who is 11 years older than me. He had been single for 3 years prior to meeting me but married for ten to his ex wife who he is now divorced from.
We started taking things slowly last year and were still very much in dating stages of a relationship. I work in a shop (a chandlery) and have worked there for a few years now which is how we met. As I pretty much work on a marina/boat yard I know many of the regulars who come in and have become friends with some over the years.
One guy, who I regard as a friend who comes in invited me to a bbq last year in the boat yard itself. Not just me, there was a few people there from the marina and a good mix of ages - say mid twenties up to people in their 60s. Pretty much all of them I know from my job. I thought it was a good idea and happily went along after work. We had the bbq then were there for ages listening to music and chatting random stuff, just socialising.
I get a text from my partner (we were only just at dating stage at this point) asking how I was. I told him 'fine, just in the boat having a bbq with x, y and z plus some others'. Then I get a text back straight away saying 'are you taking the piss out of me?'. At this point I didn't have a clue what he was talking about so I called him and he kicked off because apparently the guy who asked me to go fancies me 
this is according to my partner anyway. I spent all of the following day apologising to my partner for going and was made to feel like shit for it! I should have left then but stupidly I stayed with him. He behaviour left me gobsmacked.
He works weekends and I was invited to a wedding. I put the offer there to him if he wanted to come but I knew he had to work. He was ok with me going by myself as was I. It was a long time friends getting married who I hadn't seen since I was about 18. I went and there were friends there I hadn't see for a long time. One of the guys in the group got drunk at the reception and he was talking to me. At one point in the night he came up behind me and put his hands around my waist as we were dancing but he only did it to tickle me, not to be a perv or anything. I laughed when he did it and another friend managed to take a picture of the precise moment. It was a really good night. I got home and spoke to my partner about it the next day, told him how it was. He seemed fine. Eventually pictures of the wedding reception ended up on FB and my partner saw them. He saw the one of my friend tickling me and me laughing and he went mad! He didn't even ask me what happened so I could explain it was all in jest. He came out with 'who the fuck is that dickhead, I'd knock him out' straight off the bat. I explained who he was and what was happening but he kept saying 'I couldn't give a fuck, he's a prick!'. He gets so angry easily, there's no inbetween.
Another thing, an old friend (different one) messaged me on fb to see if I wanted to catch up as he was working in my town. He was going out with his work mates (male and female) and invited me to tag along. He has a fiancée. Anyway I agreed and invited my partner to come too. Again he was working so couldn't come and he didn't have a problem with me going. I met up with my friend and some of his colleagues for drinks. Most of them went home after a while so in the end there was four of us: me, my friend, one male colleague, one female colleague. I was driving so drank cokes all night. We decided to get something to eat at an Italian. Afterwards we went to a bar. Just after 10pm I decided to call it a night and go home.
I got home, partner was at work still so I sent a courtesy text to let him know I was back. He said 'ok, have you just got back now?', I said 'yeah we went for a meal and then a bar'. He replied with 'are you taking the piss out of me??' (Again!!). I said 'no', he followed it up with a bombardment of texts about how I was a 'slag' and a 'fucking slut' etc and that I should have gone for a drink and come home right away. I explained friend is engaged, I spent my evening talking to his female friend but none of this mattered.
The thing that bothers me most is how angry he gets. There's almost like a 'coldness' behind his eyes when he flips. I can't explain it well. There's other things he's done too but I've probably gone on enough now. We end up rowing all the time but I always end up saying sorry and even then he doesn't accept my apologies and he gives me the silent treatment long after he's raged. He's given me the silent treatment for two days before now.
I've come to my sisters for a couple of days and have told her what's been happening. She's shocked as she never knew. She thinks I should leave him as he'll only get worse.
I haven't had many relationships before so I'd like any advice. Is this normal?
Sorry is so long and thanks