“1000-Lb. Sisters” star Tammy Slaton got left in the dust by her on-screen boyfriend, Jerry, after revealing she was pansexual — but the guy didn’t dip over that … TMZ has learned.

Jerry Sykes tells us … yes he did leave Tammy and end their relationship — as depicted in Monday night’s episode on TLC — but it’s not for the reason everyone may think … namely that she revealed she’s attracted to all types of people, which seemed to throw him off.

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You’ll recall … Tammy made the reveal, which was teased in a clip over the weekend. Jerry seemed especially dumbfounded Tammy said she’d date a transgender person. Once the episode aired, viewers found out he ended up breaking things off and moving out.

Not only did it upset Tammy, but viewers were left wondering about the timing — y’know, since Tammy had just come out and been honest about her sexuality earlier in the episode. He wants to set the record straight though … this ain’t over pansexuality.

Jerry says he needed a break, because he felt guilty about a previous relationship — his marriage, no less — and had to make amends there before he could proceed with Tammy.

As of February — some three to four months AFTER the pansexual episode was shot — we’re told Jerry and Tammy were still not romantically involved. It’s unclear if they’re still communicating at this point … but whatever he had to deal with then is still being handled.

Jerry’s at-home drama lies in his estranged wife, Kia Russell-Rucker Sykes … who tells TMZ she found out about Jerry’s relationship with Tammy through TV and friends — which came as news to her when she first learned about it, sometime during season 1 last year.

Kia says they separated, and she believes Tammy’s a homewrecker. That said, she says she and Jerry still talk … and that he helps her out financially. Seems like they’re on decent enough terms — especially since Jerry came back to deal.

Now, as for whether there’s any future reconciliation with Tammy on the horizon … it doesn’t sound like there is, at least not for now. Jerry tells us his issues with Kia still make it difficult for him to be there for Tammy the way she needs.