I've been with my boyfriend, Dave, for three years. Lately, I've been feeling like he's not paying enough attention to me. I've also been seeing pictures on social media that make me think he might be cheating on me, even though I don't want to admit it. I have been trying to convince myself that I still love him, despite our issues, but it's getting harder and harder to pretend everything is okay. I think, deep down, I know he's not the right guy for me, but I can't bear to let go…