Cant connect with boyfriend..?

k so im 19 and just meet this amazing guy about a month and a half ago. he is the BEST guy i have been with! but i have a problem..iv been hurt a lot growing up guess u could call it mental abuse and have really gotten out of that mind frame. but when i was 17 i did leave that house. after leaving i did stupid stuff with guys that i regret still and i haven't had a healthy happy relationship. iv been hurt allot by guys and now find my self not caring and dissenting my self away from boyfriends..but this guy i like allot and don't wanna loose him but cant help but loose interest..can someone tell me what is wrong with me??