Think i have a relationahip phobea! help

hi. okay Im becky, im 17, and I know this is probably going to sound very very odd to some of you, but I need some help or advice.
I haven't had many boyfriends before, infact only 1 before, I totally fell in love with him, I had been 4 ages prior to our relationahip and when we went out I was in heaven and thort he was too. we split up after 8 months, it was his decision not mine, he'd frallen out of love and I was broken. not just heart broken but my life fell apart, adults say teenagers don't really fall in love properly but I did and it took months to even be able to say his name without bursting into tears and breaking down again. I was a mess but slowly, because it was a very very messy hard breakup (on my side) I started to go out more and actually enjoy flirting again and being single. I would go out on evenings and flirt and dance and often kiss gorgeous guys then next day it would just be a happy memory and although sometimes I got dissapointed when they didn't show further interest I was happy like that, it was uncomplicated and fun.
recently I took a summer job and working there was a boy my age, we got along well, lots of flirting and teasing etc, he made work fun and we started getting the bus together and kissing and it was lovely, we'd text and he's sweet and affectionate and lovely and I really like him. so when he asked me out the other day I said yes without hesitation. it was nice and I felt really good at first and he seems to adore me which is nice, but . . . I don't know, over the weekend it sunk in a bit more, that I'm in a relationship now, again and when I talked to him he was over the moon about us and said at last he'd found someone who it could last with and who he really loved, and i was touched but there was definately a part of me that was like . . .
'woah! back off, becky what have you got yourself in to, quick, time to pack your bags and run, run for the hills and leave!' I hate having this feeling coz my bf's a really great guy, he's u know, exactly what I've been looking for and what I wanted, or thought I wanted. so why this? when he texts me i always enjoy it but at the same time am like, 'oh, you again, what do you want?'
I don't want to feel like this, he's lovely, and I don't wnat to hurt him or dump him, so whats wrong? du rekon its just taking me some time to adjust to a relationship again? should I stay a while see what happens? is it normal to feel a bit like this after being hurt badly before? or am I just scared of long term commitment?
its like, nothings really happened yet, but even so I'm thinking about how much simpler it was when I was single!!!!!!!!

please, please help!
I really like him, and I don't want to feel like this, I want to try and make this work.

sorry this has been such a long post, got a bit carried away. love you all.

THANK YOU! x x x

Hi becky

dont ever let anyone tell you teenagers dont truly fall in love - they feel everything so intensely- and love is certainly no different-you have loved and it hurt....i remember my daughter describing herself as broken too-its awful....im so glad you have learnt to go and have fun again-im doing the same about 30 years later than you and i was fairly sure there was no more fun to be had-i was wrong!!! the flirting and fun are great and its natural that you want your cake and to eat it too!! also it is very natural that your sensible self protection antenna is up - you have been hurt and you dont want that to happen again...and single is nice and simple!!! youre going to have to set some boundries for this so you dont get swallowed up in the relationship if you go ahead with it...keep "ME"time,go have fun with the girls....(and i mean just the girls!!)keep your life-it makes it more fun and easier to deal with if things go wrong-he is not your whole life then...it does take time to adjust and being a bit scared is very normal-but look at him really clearly and decide what you want-then have the best fun with your choice!!he sounds lovely -i hope you have fun xx