what's wrong wif me~

i dun know what's wrong wif me recently..i m always jealous n suspect that he do something n keep secret wif me..i always have doubt...ppl said,be a couple,must 100% to believe each other..that is the way to keep relationship forever..i know that..n i try to do that..but i think im must b crazy..mayb he did hurt to me b4,so that now im hard to trust him..i m start to checking him,ask him what he do whole day..even im not calling always..but keep thinking what he doing now..juz like now,he call me said not come to find me,bcuz wanna find he fren to mention about business things..i totally believe what he said..but turn around,i m thinking that today have new worker a young girl come to work..i start to thinking dun know izit he lying me,the truth is that girl ask he out to thanks everything or other..OMG~shit..i m really crazy n think too much..over much..i juz realize that his had been important to me..i can't lose him..i can't..i dun know what can i do..i juz keep asking n asking..i know he will feel fed up..but if i din't ask,my heart is uncomfortable...really wanna change..change myself..change from doubt to believe...izit can easy to change?..i dun know..at least i have to start to learn it from now..