Even though Will and Jada Pinkett Smith issued a statement saying their marriage is "intact," In Touch Weekly is sticking to their story that the couple of 13 years is splitting ... and Marc Anthony may be to blame, according to the mag.

According to In Touch, Will Smith has grown increasingly suspicious of Jada's "uncomfortably close" friendship with her HawthoRNe co-star Marc Anthony. An insider tells the mag:

    "Will expressed worry to some close to him that there was more than just on-set chemistry between Jada and Marc."

Reportedly Jada moved from their Malibu mansion to their Hidden Hills estate because she "needed space." In Touch says Will paid a surprise visit to Jada in August to confront his suspicions of her relationship with Anthony and "his suspicions were seemingly confirmed." The insider adds, Will "left crying. He was very upset."

Pinkett Smith's rep released the following statement: "Everything about Jada and Marc Anthony is false."

Jennifer Lopez and Marc Anthony announced their split on July 15.