Am I just being paranoid?

My fiancé and I are going through a tough patch. I lost my job and he’s been under a lot of stress trying to pay the bills. I’ve been looking for a job and going to every interview possible and cannot get one. I cannot seem to have any luck to work with our schedule. He got a second job so I cannot work nights bc the jobs I get want me to work later in the evening. Which do not work at all. He will be working a 40 hr job during the days and then 20 hr job at night. He will have possibly an hour to 2 hours in between. I told him how I feel all of this stress is my fault and he assured me that he doesn’t resent me or blame me. I just constantly feel like a burden and that this money situation is hurting our relationship. He seems fine to me but I just constantly second guess thinking he will leave. I get this sick feeling in my stomach just thinking about it and the stress it causes. We discussed options with his mom and she said we should be okay and it will be tight but I had to keep looking for a job. I honestly am about to work at Kroger or something but he said I had to do something at least 12 an hour to pAy the bills. What do I do??? I’ve talked to him about my feelings and he assured me it’s okay but I still worry soooo much. HELP????