Lost, hurt, confused and heartbroken

Hi, I have been with my fiance for almost 3 years. we got engaged just over a year ago. since we started going out, I have been aware that he has problems with telling the truth. Everything he told me at the beginning was a lie, and i believed him, he cheated on me, several times in the first few months of our relationship, and i stupidly stayed. i sometimes wish i had walked away. We stayed together, and with the odd slip-up things started to get back on track. We got engaged, we were happy, living together, looking forward to future etc. Its all fallen apart this week, i find out he slept with another woman before we went away on a holiday with my parents, he had bought a mobile phone for secret sex meetings and was signing up to dating sites and putting adds on internet for sex. when i found all of this out, i was devastated. i was beginning to trust him again, i didnt believe he would do it again. :-( hes broken down and says he needs help/ he doesnt want to be like this anymore, he wants to change who he is etc. and i just dont know whether its an act or its real. he didnt have a great childhood, with a bad relationship with his dad. but i still dont know if im making excuses etc. i would love help, i feel lost, lonely and devastated. I love him more than anything in the world but i just cant believe he feels the same.....

I feel sorry for you and ur relationship. Personally I haven't been in kind of situation you're in right now, but my friend had. Instead of cheating, her bf was an addicted gamer, he got angry so often without solid reasons. My friend felt desperate and sorry to herself. At the end, she decided to be loyal and wait. It took 2 years of waiting until her bf changed his behavior. It's not an instantanous process though, time is needed to learn from mistakes and be commited not to do that mistake again. My friend was able to endure the pain and she believed that her bf would get better. If you think you're patient enough, then carry on what you're doing. Think of it this way, is the effort of waiting and fixing ur relationship worth what you get (ur bf), if it doesn't pay off, then he's not worth it.