Did I do the right thing leaving him alone?

well on april 17, my period came on. it had been switcing lastly because I stress so much with school and home. Im only 17, and I have a lot of things going 4 me. I have a boy, who was the love of my life and he broke my virginity, about 6 months later we broke up, because he decided to mess with a grl I used to go to school with. soon we talked everything out, and I decided for us to b friends, I mean he was my first and I havent been with any one else..n e ways well our friendship has lasted up to 2 years, where we have sex any time with no strings attacted because after all he’s still with the same girl. I’ve found myself 2 b stressing a lot and my perid hasn’t came on yet. see what happened was at the beginnning of may was our last time, and it was before the first day of my period was pose to come on. Because it hasnt I have really been stressing a lot..I have no signs of being pregnant, and everytime..WE USE A CONDOM, except for that “famous” last time…he always conplains about how my feelings arent true because I wont let him go in without a condom…I told him”1 mistake can ruin my whole future”…he agreed but decided to go against my word and go in me without a condom. I became very upset, I shoulda checked,everyother time I would. I found out before he came, when he pulled out and came on my stomach. I was very upset, and called him everything but his name then I became physical. I was 2 upset to wonder the outcome of my anger would bring, but my older cousins a boxer and his mother is a self-defense trainer so I know where to hit and not 2 hit, I stayed with then practically 4 about 5 years..n e way..I left him alone after he went behind my back. I told him that I had no idea what he was doing to the other girl or what she was doing behind his back, because behind hers, he was with me and gods knows who, because a lie isn’t any thing to tell. I need to knoe am I pregnant..I talked 2 a couple of friends that know my business, all of them say its stress…but 2day is the 23rd, and my period was pose 2 come on the 17th..now im friends wit this other boy and he’s nice but I keep comparing him 2 my last, we havent had sex and I want it 2 remain that way..I need major help…can I get some advice please..did I do the right thing leaving him alone