Anxiety in love

So I’ve been with this absolutely amazing guy for nearly 6 months now I really can’t say anything bad at all he treats me so well I truly believe he is the love of my life . But I keep on getting really bad anxiety without going into to much detail I had a quite traumatic childhood where I was told no one would ever love me or take care of me so since I’ve met this guy that does all of those things and is incredibly caring I just can’t help but feel so emotional and anxious and somewhere in my stupid brain i still think it’s just to good and surely no one can really love me that much . I’ve always dealt with everything alone and now I’m with someone that looks after me it really scares me because I’m just not used to it ….. any advice ?