break up and start over with forgiveness.. help

Hi everyone, this is my first post. my first time seeking for help online, i really appreciate some opinions and advices. Met a guy through an elder friend whom she thought might be a good match for me, I am 26. We liked each other a lot. Have a lot in common & we just clicked. Just after a few weeks into the relationship, we had sex, it was great. We both wanted to save it until after marriage, but didn't. As we chatted, we got to know about each others' past. He was not my first, but my 2nd. He cried once because he loved me so much and wish he was my first. (Do guys have this way of thinking?) He said he wanted me to find someone better than him, someone who can love me with all his heart. Ok, on the other hand, I am not his first either. I'm his 2nd gf. He broke up with me very suddenly on Feb 4. (after 6 months of dating) I was shocked. There was no signs whatsoever. He said he has been in another relationship with another lady. It was very sad and heartbreaking. Although I knew it was not possible, I had to believe what he said, because that's what he wanted, to break up. He told me not to contact him again. I missed him so much. My friends n families supported me through my hard times. I wish I knew what was the real reason behind the break up. I kept telling myself, if, he comes back to me one day, I will accept him again. A month and a half passed, I have partially moved on. One day, we ran into each other unexpectedly. My heart jumped. He didn't look too good himself. I wanted to ask him how he was doing, but part of me didn't want to, I was still hurt for what he did. A few hours later that day, he called and asked me out for a drink. We just chatted like friends. Eventually, we started calling each other. A few days later, he sounded very upset and apologized for what he did. He explained to me that he made up a lie so that I could forget him. During those times when we were apart, he missed me everyday and felt very bad for the break up. He wanted me back but was too late. It was an coincident that we met again that day. (Could it be fate?) He proposed to start over, promised to not do what he did and regretted for hurting me. He said he can love me with all his heart because I am more important to him than anything else. He will never hurt me again. He's willing to accept my past and let it go. He even talked about marrying me and spending our lives together. Do guys change their way of thinking for the one they really love? I'm just worried that one day, his thought of my past (the fact that I slept with someone else before him) might come up again. My friends do no know the real reason for our break up. But they do not encourage me to get back with him. I told him I needed some time to think it over, whether if I want to start over again. Deep inside, I need him and I still love him a lot. I do not want to give him an answer too soon. How long should I take before saying 'yes'. Am I making the right choice? Can I trust him and start over? Thanks thanks

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