when both of you have too less communication (which is really affecting bad on the relationship)...lesser communication...lesser understanding..leads to breaking up...
I think there are many signs, but it depends on how the relationship was in the first place. In my case, it would be if the two talked to each other less than they did when they started.
when your boyfriend flirts infront of you when he doesn't spend special dates with you when he rather stay home than spend time with you when he always forget about you while being with his friends
-When he only says "I love you" when you tell him to. -When he gets saggy and fat and blames it on you. -When he wants to get home earlier than he used to. -When he gets mad at you for doing something in an online game without him (which is something he's done to you plenty of times). -When it's "ok" for him to do certain things, but you can't do the same things. -When he introduces you to some people, he introduces you as his friend. -When you wait hours for him to call and apologize for his childish anger, he doesn't. -When you're fed up with waiting for him to call and apologize and decide to call him instead, he doesn't pick up. -When you call him 100000000000 times until you feel like a stalker and he never picks up. -When you find him on an online game and he knows you called him a 1000000000000000000 times. -When you try to "make peace" with him in the online game. -When you tell him that you think the relationship isn't working and he doesn't say anything. -When you write all your relationship problems on a forum. -When you feel like a broken and depressed piece of shtttttttttt because you're wondering if you'd be happy with or without him. -When you're me.