Would you put up with an insecure partner?

Im incredibly insecure and I know that im basically ruining my relationship because of it. I hate that im so insecure and I dont even know why I hate myself for it. I was cheated on by my ex, I walked in on him having sex with his flatmate and after we broke up it transpired he had cheated on me with about 6 girls including my best friend. He also admitted that whenever he went out clubbing he would get with girls and wouldnt tell them about me. I was completely heartbroken and it badly damaged my self confidence and created massive trust issues. However this was 2/3 years ago so I dont understand why I still feel like this. My current boyfriend who ive been with 18 months is great he is very trustworthy kind and patient but I just cant help thinking he's going to cheat or he's on the look out for somebody better. He is very flirty by nature and a bit of a 'lad' so im pretty sure although he'd never ever cheat when he goes out he does flirt with girls but it never goes any further than that, but im scared one day he will be to drunk or meet such a great girl that he will cheat on me I dont feel attractive I think im a dog i never feel sexy or pretty, when i go out clubbing usually i just want to cry as i feel a ugly freak, i constantly compare myself to other girls and think how my boyfriend would prefer them to me. He's had a past with lots of casual sex and one night stands and im worried i cant fufil his needs like these woman did. I cant help myself but whne he goes out i just panick and turn into a complete cow we argue constantly over it yet i dont know why im so insecure or how to stop it. I know im very very close to loosing him, he;s going to ibiza for a lads holiday in summer and really i want to not be sat at home worrying etc etc. What woyuld you do if you had a very insecure partner and any ideas how i can stop being so insecure ?

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