How can I cope with my boyfriend's stress?

So my boyfriend and I have been together for about 3 months now. I have really fallen hard for him and love him to pieces and I am so scared to lose him because I have really bad trust and abandonment issues because of a rape I went through 5 years ago. Lately my boyfriend has been under a lot of stress because he has a full time job and works really long hours and some other work related issues. He apologized to me last week for acting distant and told me that stress makes him push away people and told me that he was going to work harden on our relationship. I was thrilled and then 3 days ago he found out his uncle passed away. Ever since then he has been very distant and rarely texts me and hasn't called me. I texted him and asked him how he was doing and he told me that he is sorry for being distant and is trying to take some time to himself. I am very scared of losing him and him being so distant is really taking a lot out of me. I really do not know what to do?