What to do now?

I was seeing this guy and he left me, just dissapeared no contact nothing. i got over him his done it before it was my mistake to take him back again. i found this amazing guy mark and we started seeing eachother he told me he didnt want a relationship because we both have school to finish this year but he wanted to see me still. one night when mark was over my ex came over unannounced and mark walked out of the house after the ex explained his back cause he heard i was with someone else and was upset i didnt tell him he made me feel bad and i go lets be friends and i told him i loved mark. the next night we had a fight and he came to my house wanting to "sort" things out nothing happened but i told him that we cant talk and we deleted eachothers numbers because i was willing to give it up for mark the only problem is that the ex was over till 2 am nothing happened we just argued over and over till we came to the conclusion of not being friends no longer. the next night i told mark everything and he called me the next night saying lets be friends, he wants to be free...

is it my fault that he doesnt wannt me anymore, he said its cause he doesnt want a relationship. and pulled out stupid examples like you dont like me talking to other girls and that was never the case i dont give a crap if he does but the girls he talks to all ask lets hook up obviously i have a reason to care if were seeing eachother.. all he says is im not your boyfriend to care.. argh confusing!?

He told you in the beginning he didn't want a relationship, what's confusing? He still says he doesn't want a relationship, nothing has changed, but maybe your feelings.

Yeah but he didnt want a relationship
but he still was seeing me...
talking to me more then a friend
it was leading into a relationship and then [swearing is not needed]

Why is your EX--No, scratch that... Why would you ALLOW your EX to stay over at your house until 2 o'clock in the morning?

Well Mark did say in the beginning that he didn't want a relationship. Maybe he wasn't aware that he was leading you on, maybe you saw things there that weren't, maybe he was just looking for a female friend without the strings that go with relationships *never understood how people do that but anyway*. If I was Mark and the girl I was "kinda seeing" let her ex stay at her house till early in the morning like that...I'd leave her too. It's common for people to lie about what they do with people, how is he supposed to know that you and your ex only talked? It would sure the heck throw up a lot of red flags for me.You should NEVER stay in a room or place that there is only the two of you, thats asking for problems right there, especially with an ex. Their will never be anyone to back you up.

Well i can't necessarily say wether it's your fault or not because i don't know the guy, but what i can say is it might be that he was content in being together with you, but not serious..until he saw the ex boyfriend drama and maybe considered that your feelings weren't quite gone and he didnt feel like everything was stable anymore.