How to accept/love healthy relationships ?

I recently started a new job and I work in a department with 2 amazing ladies. We all get along great but I've come to realise that sometimes it makes me uncomfortable. I say this because previously I was at a job where I was taken for granted, held back and was mistreated. Now that I'm at my new job, my new boss makes an effort to mentor me and help me develop my skills (I'm a lawyer) and shows an interest in my personal and professional life. I'm really grateful for the kindness and concern but it makes uncomfortable and I tend to shy away from the bonding or certain social activities because I'm not used to it and I don't know how to accept it.

I've also come to realise that it's hard for me to believe the guy I'm talking to really cares about me. He's the first guy that really really makes and effort to check in and make sure I'm okay. He goes out of his way to let me know that I'm important to him and that he loves me.  I know he really cares because I was in a car accident a couple weeks ago and he came to the site within 15 mins. He lives about 10 miles away from the accident site. It's still hard for me go accept that and although it's clear as day that he cares.

My question is how do I allow these people to accept and show me love and healthy relationships without feeling uncomfortable? It's almost as if I don't think I'm worthy or deserving of the love they are giving me. In my past I wasn't treated the best so I guess that's why I'm hesitant with these new relationships. I am really grateful to have them but I don't want to mess them up by holding back or not returning the effort given. I know that step one is identifying the problem but where do I go from here?

Thanks in advance ❤❤