Suggestion needed!!

Hey Blind community, so I joined Oracle this January as an IC2 after giving Zoom interviews - there were 4 rounds in total. A couple of those interviews were taken by a senior from the same team that I ended up joining. So, in my first week when I was chatting with some of my team members, out of the blue, the senior asks - Hey, did you see answers while giving the interview? I was like - obviously no, aim is to get hired by Oracle, and not blacklisted. All of my rounds were conducted F2F with 2 interviewers sitting in each of the rounds, so cheating was definitely not an option. I let it go by, didn't bring it to the manager's notice.

About a couple of months back, I was stuck in something and I pinged him about it. He said that he was busy and would be back. We had a team meeting shortly after that, in which I was asked about my progress. So I did mention that I'd be going through it soon and after the senior was done with his own work, I'd be discussing about it with him (Its related to some legacy code, which the senior had worked upon quite a bit till then). The meeting ends and when I come back, I see that I had received a couple of messages from that senior stating that I was playing a blame-game. Upon further asking what he meant, he told me that I shouldn't have mentioned in the meeting that I was blocked since he didn't reply back to my message. I told him that I never worded it like that, but then he just kept on saying that whatever I stated, the only conclusion that could be derived was that the senior wasn't helping me. Since then, there's been quite a bit of animosity from the senior wherein any of suggestions or code-changes have been reviewed over-critically. Plus, if at all I do take a leave any day (I have a chronic lower
back pain issue), I'm always asked by the senior as to which other company I'd gone interviewing for. Also, I've been observing that whatever projects I was told to be expecting to work upon are getting reassigned to other people in our team - I believe my performance has been quite decent till now and it seems as though the manager doesn't have any problem with me (no untoward incident in my 1:1s).

The senior guy does suffer from burnouts constantly - this is known to almost everyone (execept the manager) in the team, and he himself has been open about it.

What should I do in such a scenario? The manager consults this guy over every other important scenario and I want to maintain a healthy relationship (this is the reason as to why I haven't thought about informing all these to the manager), but feeling stressed out due to frequent gaslighting.

YOE : 2.5
TC : 165k