3 years and he's fallen out of love with me

My boyfriend and I have had an amazing 3 year relationship. He stepped in for my kids and I when my daughter was 3 and my son was 1. He's been the only dad they've ever really known. Our entire relationship we've never had a fight. We broke up once in the beginning because he didn't think he was ready for the kids but had a change of heart and we got back together. Things have been amazing ever since. He's my best friend. 3 months ago he got into a wreck ( he's a truck driver) and was out of work for those 3 months. He got 2 jobs to keep up with his car and insurance payments but I've been the bread winner. Which i don't mind at all! Well 2 weeks ago.. all the affection stopped. He stopped cuddling me, kissing me, even sitting next to me. I asked him repeatedly what was wrong and he said he was just depressed and hated that he's no longer the bread winner. I explained that i love him and that soon he'll be back on the road and everything will be okay. So for the past 2 weeks I've been trying to give him space but also be there for him. 2 nights ago he told me that he wasn't nervous about getting back on the truck.. his issue is me. That he feels a drift. He doesn't have the same feelings anymore for me and that's why he's been so distant. Because he doesn't know if he wants to be with me.

I lost it. And started bawling. 3 years...3 years and now this. I'm at a loss. I'm so hurt. For myself. For my kids. I don't know what to do.

Any advice is welcome. I can't even think straight.