<human>: Can you give me a shortened version of the text?

Throwaway obviously, but I've been with my gf for a little over a year and a half. Our sex life has been excellent, at least I think so. We have a TON of sex usually more 8-16 times a week. 

I don't think I'm pleasing her the same way I used too though. She doesn't get off when I go downtown and in the past month or so I've noticed her masterbating when we're all done having sex and getting ready to sleep at night. She waits like half an hour after we say goodnight and then starts. I'm super scared that I'm not getting the job done for her. My weight has fluctuated up and down about 10 lbs since we started dating, it's not like I got fat or less attractive physically. She still says she loves making love to me but it's hard to believe when she doesn't have as many orgasms and masterbates next to me. The first time I noticed, it was super obvious after the worst sex we've ever had, I got nervous and just left the room. We talked about it in the morning and she denied it and said it shouldn't be a big deal even if she was since I hold my privates in the morning sometimes (not masterbate though).

Has anyone ever been in this situation as her? Tonight we had sex twice, and less than half an hour later she was doing it right next to me. I went to the bathroom, then got dressed came home and made this post. So any advice from someone with more sexual relationships experience would be super comforting.
<bot>: gf jerks it next to me after we have lots of sex, should I be worried I'm not satisfying her