Does your SO sabotage your weight loss efforts? Does he or she feel threatened by the new (or soon to be) you?

I have battled this situation over and over again with my bf. Every time I lose weight, stick to an exercise plan, tone down, whatever.....he feels threatened that I will leave or find someone new...and I give up everything I've worked so hard for because of his insecurities.

What do you do or what do you suggest I do to reassure him that I am not going anywhere but, I need to be healthier and weightloss along with exercise is a necessity? TIA

keli