I disagree with some of the posters on here who may be being a bit dismissive of your relationship, my boyfriend is also a very jealous person but he knows he has a problem with this and wants to change, its been a long time since he's trusted me completely but I've always believed we can make it work so I've tried to calmly reassure him that he's the only one and when he's been irrational explained things clearly so that he can see he's only paranoid, it hasn't been easy and it's still not all of the time but things are getting better and I still believe we can make it work.
However, his jealousy was more as a result of paranoia from drugs (which he has now stoppped) so he had to make a change as well, if he hadn't done that then I don't think I would have been as willing to work at our relationship as much as I have.
So what I'm really trying to say is that if you think there is light at the end of the tunnel and he knows that there's a problem you both need to work at then go for it, if he's not on board or you can't see him changing then it'll be a very difficult relationship