I need help getting my ex back :((

we kept in touch while broken up even when i went overseas to visit my dad for 5 months we sent each other fb msgs including bday wishes and even flirted a bit like when we first started going out. I called him twice when i was away. The 1st time was very casual and comfortable and the 2nd time i brought up getting back together and how i could see some of my stuff that bugged him. he basically said to me that we have given this thing enough chances and that its not fair for me to come back after 4-5 months and getting him all confused again. I told him that the chances we gave each other were too soon cuz we never had the chance to reflect back and that i just want to him to think about it. at the end of the convo (i think as a last resort) he said he is dating someone. I acted completely cool with it and said i'm sure she's nice but she'll never be what i was to you, just like no guy will ever be what you were to me. i also told him that while being away i met someone (a friend) who had all the stuff i always wanted him to have (be able to argue about everything! yeah i know! but i wanna be a lawyer so...) but it was not attractive to me anymore and made me realize what i had was in fact what i wanted. After our convo he went to fb and changed his relationship status to "in a relationship" which is so weird that all of a sudden you're doing this! So I have been back home for about 3 months now. We keep in casual contact like every week or so we text each other to see how the other is doing but i never brought up getting back together again. I have seen him about 7-8 times now, most of it was his idea.Once i gave him a whole bunch of stuff i had brought back for him to let him know i was thinking about him. He loved all of it. I have seen him with friends and also alone. He always seems to want to make the night longer. It starts with meeting up and leads to dinner and then coffee... this is usually when we're with friends. He still pays for my food, we share food and sit next to eachother. I've been told that to other people it looks the same as it always did, like we're still dating! When we're alone he seems very comfortable like usual, he has played with my hair commenting on the fact that i had straightened it (i have naturally curly hair), he has smacked me on my ass or bit my ass as a joke, he has ticked me, sat on top of me and grabbed my boobs as a joke while i'm lying on his bed (and i could tell he was excited if u know what i mean!!), and now last week when i took him some coffee while he was at work, we were saying goodbye and he kissed me on the lips, very quick, more like a peck like he usually does when he says goodbye. I thought it was a reflex and i looked to see if he'll get nervous or apologize but he just smiled, held my hand for a sec and walked off. A couple of days later he texted me again and we met up for coffee, he was very casual, commented on my boobs and bra as a joke but then something happened. He walked off to take a phone call and i had his ipod. I clicked on his mail and found a couple of emails from a girl with a picture of her with the words "Love you, i'm sorry :(" on the pic. One email has the colored picture and one has a black and while pic, same pic, same words. and there was one email to her with no text, just the subject "love you"!!! Do you think he is in love with this new person now? she is not here, she is long distance but i have seen him text people when we're out with friends. What do you think i should do??? I really want him back. it was 7 years :(( and i love him sooooooo much.