I hope Jamie Borthwick, who plays Jay, doesn't quit or get shown his marching orders soon - Jay is one of Eastenders' most underused characters, and Jamie has proven time and again that he's a good and capable actor worthy of big storylines. But TPTB seem to think Jay's character is better off being a minor part in a Mitchell storyline.
The producers/writers/whoever, in my opinion, need to decide whether Jay is either an actual character on his own and give him storylines of his own, or just continue treating him as a glorified extra once Lola has left and until the Mitchells have yet another big storyline that Jay can just be added on to as an afterthought which, frankly, is the biggest insult to Jamie Borthwick's acting talent.