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

Dear runnit,

I need some advice or motivation  to get back on the horse.

Running-wise, the last couple of years have been really good for me. At some point in the middle of 2012 I was 145kg (height 1.85m) and I couldn't run even if my life was depending on it. 

Suddenly, I decided to start doing some exercise, particularly running. At the beginning it was really cool, my knees where hurting but little by little I made some progress. 

I decided to take it seriously and I signed up for a 5k around November 2012. The 5k race lead to a 10k until I build up endurance to the extent of running (like really running) my first marathon last October. I was really happy. I achieved something! I was more or less fast and most importantly, I had a good "normal" weight, around 98kg. 

After that marathon I was feeling ready to start training for a triathlon or something like that. However, at the beginning of 2016 life got in my way. First, my girlfriend move to another country (which was really shitty), then I started writing my thesis, working a little bit harder and not exercising at all. I used to go for a 30 min run or to the gym, but suddenly doing exercise felt boring until I stopped completely. The result of this was me gaining a lot of weight (today I am 115kg).

I went for a jog today, only 2 km, and I was feeling so heavy, slow and sad I had to sit down on a bench at the park and started sobbing, it was awful.

During the whole process, lurking at this sub and reading about everyones achievements and stories has been really helpful to keep me interested in running. That's why I now turn to you guys and ask: Do you have an advice or anything that can help me get motivated again? Something that can help me enjoy running as I used to.
<bot>: Lately I've been feeling bored and sad whenever I go for a run. Do you have an advice or anything that can help me get motivated again?