Maybe the cracks are beginning to show now that you've been together a while OP? Couples who are fundamentally incompatible, usually manage to gloss over their differences for a while, but as time passes and the relationship begins to get stale, that's when the things that previously were brushed under the carpet in the rosy glow of love, begin to irk, and ultimately lead to quarrels and the breakdown of the relationship.
For example, how many people tell outright lies at the beginning of a relationship simply because they fancy the pants off the other person, and want to be their 'perfect' partner? I'm sure we've all done it, perhaps claimed to love football, classical music, or whatever the other person enjoys, when in reality they can't stand it. Gradually as the relationship goes on, they can't keep it up, and find spending hours standing outside in the cold, watching a bunch of men running around after a silly ball, just too much, so start making excuses not to go along. This might work for a while, but then kids come along, and suddenly she, who professed to 'love' football, begins to get pissed off by the fact that her partner, wants to spend most of the weekend, either playing football, watching football, or worse still both, while she gets sole care of the kids. This then leads to the rows, where she says 'You never want to spend any time with me and the kids', and he comes back with 'Well you used to love football, but you never want to come and watch me play anymore!' Ultimately in all too many cases, this sort of argument leads to the complete breakdown of the relationship. At the end of the day, if she'd told the truth and said she actually loathed football, they'd have probably saved wasting years of their lives, as they'd have realised that they really weren't compatible after all. You and your DH are NOT compatible OP!