How to trust my boyfriend again?

I have been dating a guy for a year.. beginning of this year, i started to get busy with my work.. hence, i travelled extensively and due to time zone difference we hardly talk with each other during the period of time.. One day, I found that he was cheating on me during the time. I was so furious and decided to end the relationship. But we end up together again after a few weeks time.. he begged me to forgive him and he was truly regretted of what he was doing. i decided to give each other a chance and we have been back together. (he used to do the same in the previous relationship).

Since then, we were together again.. but until recently i found that he has contacted someone i don't know or never heard of. I confronted him and he told me the reason why he hide this was because i will think wildly. He promised the person is just a friend. I believed him again but i started to be suspicious.. i started checking his phone while he was showering, my mood swing up and down whenever he is not around.. or never message me when his what's app show last seen was few minutes ago, i started to see him everyday.. if i do not see him for one day, i feel insecure. I hate myself for become someone crazy like this. I become a control freak and I always remind myself to keep myself cool, but i will back to doing all this stuff again.

I never realized that the betrayal hurt our relationship, or me so badly. I really really want to trust him again but i do not know how to. I still in love with him and i want to give the relationship another chance, i know doing all this will only bring the relationship to the end.

Please tell me what should i do? I am thinking to give the relationship a break and see how things go after that.. but i really love him and i do not want to end this.

please help..