Am i doing the right thing or being optimistic and being a typical 16 year old making mistakes???? please help?

The boy i loved turned into a idiot and controll freak i got rid of him 9 months ago now and i feel great about it but lately he's been intouch and i don't feel nothing for him but he's telling me i won't find another guy that will care about me as much as he does i'm so confsued as we got together whn i was just 14 i been after him for about 2 years before he treated me properly then as soon as he stopped treating me mean and stopped going with my friends he become some controlling boyfriend (he was 17 at the time and ped his driving test) he was always taking me out and i never really got to see my friends i lost touch with most of them and thing got more serious with him but i turned 15 and just seen my friends have fun and wanted to be the same but he wouldn't let me he'd stress on me if i asked to go out and say it wasn't me he didn't trust it was the boys (yet it takes two to tango) i'd never be unfaithful to him before so was confused on why he didn't trust me! My mother thought he was great cause i was maturing quicker than all my friends. The real problem was he hated my friends and so was hard for me to juggle them both, i tried to finish it with him then but he'd ring me pleading for me back and just wouldn't leave me alone. he even put me on contract and payed for it so i could ring him on my way to school at break and at luch on my way home from school and before he picked me up from work, we had some laugh but i felt it was too much losing my friends so young so i was thinking about finishing it but as it was so close to christmas and my mam had bought him loads and his parents spoilt me i just didn have the gutts to spoil everything but i told a close friends i'd had enough and had though about finishing it but was going to wait until after christmas but some how it got out and he found out and turned it out that i was gome money grabbing b***h when this wasn't the case we argued alot over this and i got fed up so i ended it in the begining of december but he followed me loads and we argued in the middle of the street and he hit me that topped things for me i was gone for good but 9 months on he still wanted me back although i give him a chance early thing year and he got some girl pregnant and i was still sleeping with him as i didn't now then i found out went mad and she reakoned i was a home breaker, also another girl gave him a STI which i was lucky i didn't catch because he never told me about this, i left thing there then because of the baby and then she had a miscarridge and he soon wanted to now again saying he only went with her for the baby's sake! now he's still bothering me getting me quite down i've dropped from a size 12 to a size 8 and is haivng all sorts of other stress i'm turning 17 this year and has found a new man but can i be happy or was my ex right i was just to immature to take on the seriousness of a relationship???