First time posting (can give more information)

I suspected my partner been struggling with depression/anxiety since he quit alcohol and nicotine cold turkey. He has been showing physical and behavioral symptoms of deteriorating mental health even before the quit. He has a very demanding and stressful work. I didn’t pick it up the symptoms and expressed disappointment when he couldn’t make it to meet up. He has been withdrawing but made sure telling me he loves me when he responded. We arranged another meet up, but he disappeared (not reading texts/picking up call) after telling me he can’t wait to see me and would make plan right before the meet up. It has been over 2 weeks. I have some understanding of mental illness, I am worried and want to support him, I understand giving space is also important, but some friends and family been telling me not to make excuse for poor behaviors (they don't really know him much as the relationship is relatively new to them, we only started introducing friends and family since 2-3 months) Want some support/advice here.