Ugh, I hate that I'm even writing this. Been dating partner for a year and a half, with the first year and two months being bliss. Honeymoon stage ended, all was still great. However, the last few months a few things have happened and my head is screaming at me that longterm I might be in for trouble. For context, we don't live together currently, but did live together during the pandemic and we did it well.
I don't want to be super specific, but the 'red flags' scenarios are as follows:
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My family member was going through a hard time and came to stay with me in our city. My partner joined us multiple times for outings, it wasn't like I just ignored him! One day, I went to London alone with my family member and my partner sent me one word texts all day, ignored me when I sent normal, affectionate messages and ruined my day by being obviously annoyed and childish. I then invited my partner to our outing the following day with my family member, he agreed to come but last minute said he felt sick and got annoyed when I went anyway as I didn't want to cancel on my family member when was my partner felt mildly nauseous. Again, sent me one word text messages all night. I pushed it the back of my mind, but looking back, I have wondered if he was genuinely ill and just wanted to pull a sicky to try and get me not to go. I feel mean for even wondering, but amongst the passive aggressive comments, the ignoring me and then being mad I didn't stay in as he was ill... I feel icky about it. Am I an arsehole for not cancelling the day out with my family member who was only staying a short while as my partner was mildly ill?
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When my partner does upset me, I tell him. I communicate. Frequently, this ends up with my partner ignoring me because he feels bad. Last time I said I was upset, I ended up comforting him after being ignored all night as I made him feel negative about himself. Even if I don't specifically ask, he goes quiet on me and ignores me if I ask him to be accountable! The weird part is, he always apologises and accepts he was wrong- He takes accountability but still ignores me.
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Similar to the first one. My friend came over unexpected one Monday morning and I invited her in to not be rude. My partner had the day off, but we didn't have plans. That morning, I tried multiple times to suggest we do something and my partner didn't want to go. My friend invited us for lunch and we all went. On the way back, my partner ignored me and was very obviously upset. He then said it was because apparently he had wanted to spend the day together and by agreeing to go out for lunch, I had done a massive faux-pas.
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When he does get annoyed, in examples like above, he makes sarcastic comments about me, a lot of them very childish. "I'm going to the shops, but I won't get you anything because you x." It's almost constant at times when he's annoyed.
It's at the point now where I feel anxious spending time with my friends or family- It's almost like as soon as he doesn't feel like he's getting enough attention, I'm bad. Every issue is around me spending time with people, particularly if I do it when my partner isn't in a great mood. For example, when my relative came to stay, my partner was at a football game and didn't act 'weird' once. His football game ended and I was still out and as soon as I said I wouldn't be back for some hours, the tone of his messages changed. He doesn't even always say he's upset with me, but there always seems to be something- if I'm not there, all of a sudden there's family problems or some reason he can use to need my support. He'll ignore me all day and brush it off with "Oh I was a bit depressed."
One occasion alone, I wouldn't question, but all of this. 
I spoke to him about the incident when my friend came over (3) and he apologised and said it wasn't fair to ignore me, he was wrong and it was childish. That was a week ago and things have been great since. But all of this still happened and I'm also
at how these issues popped up after a year. I've dated people before with red flags and it's always shown up much sooner- Not after a year!
He's also not jealous romantically- I have male friends, go out and he's never jealous or possessive.
My partner is going through a hard time due to a terminally ill family member, but that's not an excuse and quite honestly I'm very unsure of if I should even commit more at this point.
Thanks for the advice!