I've nc'd for this as I'm fairly sure AIBU.
Ok so I have a friend, our DHs worked in the same field. We weren't close friends, we would speak on the phone maybe once a year but are friends on FB and would whatsapp message each other now and then.
Their relationship broke down about 2 years ago. She left him because he was verbally abusive at the very end and possibly cheated on her with a colleague. During this time I supported her and we spoke on the phone, I went round to see her etc. I had just had dd2 so I couldn't do much practical stuff although I was there for her at the end of the phone.
She's moved on and had other casual relationships and contact levels dropped back to what they had been before her split with DH.
During this time there were a LOT of cryptic "can't cope with this"/"well isn't that shit" FB posts triggering "u alright Hun PM me x" type replies. I can't be doing with that stuff so would leave her to it unless she contacted me.
She wanted to meet for coffee a few times but had moved an hour away, with a newborn and a toddler I suggested meeting halfway but got a cold "I don't meet halfway" reply 
.
I was exhausted, dealing with my own relationship issues (that she never asked about). She only ever rang to tell me the latest think her stbxh had done. I kept telling her that what he is doing/who he is doing is not her concern anymore. She Facebook stalked him, Instagram stalked him, she is/was obsessed. I was to be honest getting fed up (after a year plus of this) having the same conversations and messages back and forth about her stbxh and how she couldn't believe he was treating her like this. I kept giving her advice and support but it was like banging my head against a brick wall. I find her incredibly draining and like her life just hasn't moved on. I hope I've explained it well enough but it literally has been the same drama filled obsession with his life and what he's doing that's worn me down. She just wants to talk about him all the time and I don't get it.
Anyway onto The AIBU. She's badgering me for coffee again to catch up and I just can't face it. I feel guilty for feeling this way but after two years of this with very little support back I imagine it will be a face to face slagging off session of her stbxh that I barely knew in the first place. I haven't seen her in almost a year because of life getting in the way. We weren't that close to begin with but I feel like she uses me as an emotional venting board and nothing else.
Come on then let me have it, I'm a crap friend right?