Anybody else bothered by their partners past relationships?

Ive been with my boyfriend for nearly 2 years. I don't know why but his past really bothers me, it never use to but recently I seem to be thinking about it a lot, it just makes me feel really crap and upset. I don't understand why I have no right to be upset but it bothers me so much. My main issue with it is that I worry he will compare me, he says he doesn't because im a different person but recently hes just stopped being passionate with me. He seems to find sex a chore, he hasn't actually touched me in ages. There is also nothing unique to me and him I was a virgin when I met him whereas he clearly wasn't he has done everything sexual ive tried to suggest things we could do that be unique to us as a couple in the bedroom department ie, I once tried to suggest maybe going away for a dirty weekend, he said he cant be bothered. Yet he took 2 of his ex girlfriends on dirty weekends, but he refuses to with me. He did things with an ex which were adventurous and when I have suggested we did it again he refuses saying he had done it. He has slept with a woman who was over 20 years older than him, about 6 one night stands slept with lots of girls on holiday and had 2 long time girlfirneds. Our sex life just seems to be so boring like hes done everything and be en adventurous with girls before and now he just cant be bothered with me. I

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