<human>: Can you provide a brief rundown of the text in within 3 sentences?

We've been dating for nearly 3 years and are due to married soon and I love her dearly. Which makes this always sensitive issue very difficult  for me.

I would never have described my gf as slim however since meeting she has gained 10-15 lbs each year and is now at the point where it's very noticeable to me. Because we are getting married soon she has been trying and failing to lose weight but I would describe the effort as sporadic at best. Any knock back whatsoever and she abandons ship and returns to her old habits. 

The problem in our relationship is that I don't feel I can talk about this at all with her and when I try to raise the subject she doesnt want to talk about it or simply says it's her own business and she's dealing with it. 

 The closest I got to her real thoughts was a cryptic conversation when she said she wasn't going to allow her past problems to control her eating any more. When I pressed further she cried and didn't want to talk. I know for a fact that there's no abuse or major trauma in her past so I've no idea what this could be.

Do I continue on as things are and allow her the time and space to work through her weight management and whatever associated issues she's carrying?

Or do I get involved, try to talk about it and gently insist that she communicate?
<bot>: gf's weight gain is starting to effect us, there could be some related unresolved issues but she refuses to talk about it.