You are definitely in the right place so welcome back to the bandwagon! I know where you are coming from on the weight gain part. I had lost 90 pounds and ended up getting comfortable and putting back on 45 of it. I am now in the process of losing the excess that I had gained back, as well as an extra 10-20 to reach my goal and then maintain. My suggestion is to stick with it, allow yourself a cheat day and don't go on a binging spree but don't deny yourself either. Follow an exercise regimen that you enjoy, mix things up, and understand that your boyfriend is trying to give you support, not reallizing he could be hurting your feelings. At least from his comments that is what I am picking up. It's good that he is supportive of you though.
Also check out some challenges to be a part of so you can get more motivation and extra support from people from all walks of life and could be in a similar boat as you. You can do this!