DP thinks I'm giving up too easily

[Gnocchgnocch]

DP and I have been together for 4 years, 1 DS(2.3). We have been having problems generally for a long time, maybe before DS was conceived (surprise pg). We don't argue as such but I have had feelings of doubt for a long time and I think had DS not been born we'd have split up a while ago.
Obviously we have highs and lows and usually I would see the lows out but this time I just can't, I'm not sure I have any love left for him and looking back over the past year we have definitely grown apart. Now it's at the point where I feel like we're just friends living together. We have no sex life and if I'm honest I just don't have it in me to keep dragging it on.
DP thinks I'm not working hard enough to keep us together but I feel like half the relationship has been one long attempt at keeping us together. I'm tired and can't keep feeling like I'm the bad guy all the time.
To me this is a resolution.
So what I want to know is if I'm justified in how I feel or if I'm genuinely giving up too soon. I've lost all perspective so I'm happy to be told I'm wrong. TIA

This is ringing bells for me OP and I hope you managed to have a good talk to DP last night and feel better today.
For me when I met my XH as students 30 years ago we were equals. Same degree, same hours and salary. We planned a life sharing work part time and raising a family. Then his career took off, I had 3 years SAHM and fell into supporting his metoric rise.
Somehow I lost myself along the way. I was a willing martyr but at 50 I had had enough and walked out. XH wanted reasons, justification and was truly horrible to me for not wanting to carry on. Life is so much better for me now.
You might find the EA support thread a help as your DP sounds rather familiar to a reader of Lundy Bancroft...