Uninterested and need help

So my dad passed away about a week ago and recently I got into an argument with my best friend and she won’t talk to me anymore. I’m very sad and even though my boyfriend wants to have sex with me, I’m to sad to. Don’t get me wrong, I want to, I just feel like everything’s going wrong for me. Note, I’ve been with my boyfriend for a year and 7 months now and he’s always talking about how he wants to marry me and have a house and kids with me and he’s TOTALLY into me, but I can’t shake the feeling that I’ll get unlucky again and lose him too. How do I become more interested and engaged with him even though some tough stuff is going on?