He moved on too fast

 
     It's just been weeks since you guys broke up, your head is still not in the right place, you are still struggling to come to terms with the fact that it's over, probably trying to consider giving it another shot with him, and then you see him with another person...

     Lot's of things are going through your mind, your head is spinning, questions are popping up so fast in your head you can hardly answer any one. Did you waste all that time, was she never really into you, was he/she cheating on you all the while and you never knew? was that the real reason behind all the arguments and misunderstandings? You are really confused and you don't know if to confront him or walk away with your pride but then you are really dying to know the truth.
    The thing is,  dealing with that after breakup jealousy is never easy. The best thing for you to do is to focus on yourself and figure out how to carry on without that person in your life, you aren't going to move forward dwelling on what is past. If you really do feel you want to give it another shot then fine, confront the person and tell him what you witnessed, I trust you know the person well enough to know when he or she is lying to you but either way it's best to get it over with once and for all. At this point it's best not to play any games, just be upfront about it because playing games won't get you anywhere and might cause more confusion for you and really alter your judgement. For all it might be just their own way of rebounding, we all deal with hard times in our own way, so when you hear their own part of the story you would know what next to do from there. Either way the most important thing for you in your life right now is to be okay, pull yourself together and continue living the way you used to, you got along just fine before you met them and though they came in and made things bright and fun for the period of time they were in you life you might have to start facing the fact that it was just a phase in your life. Time to move forward and prepare for what comes next or who if you are ready...