Is he telling the truth?

My boyfriend and I have been together for 7 months and I truly think he’s breaking up with me to be with someone else. We met through my sister (their idea). They were friends and stayed friends throughout our relationship.

We’ve broken up in the past four months ago when he ghosted me for two months. I will never understand why he ghosted me but he contacted me sister and told her he wanted to work things out with me. I tried asking him why he ghosted me but he never gave me a actual answer but later admitted he couldnt get along with my sister. I don't understand it because he contacted my sister first when he came back to get me to call him.
This time my sister wasn't involved at all. We dated again and now he’s ready to end things again. He’s been grumpy and mean to me for no reason. I asked him why was he like this and he said it was because he was tired of our relationship and felt forced to be with me also taking it out on me. I asked him why did he even bother coming back and he said my sister made him talk to me, not sure what that means. My sister explained she never said anything like that or made him do any thing.

Is he telling the truth?
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