I think that Casey was obsessed with Tony and don't think that her playing around with other men proves otherwise.
Diane Down's craziness over the mail carrier that didn't want kids (called Lew in Ann Rule's book) didn't prevent Ms. Downs from sleeping with other men. She slept with men right and left in addition to the male carrier she called the love of her life. Like Casey, Ms. Downs always had back burners going. It is my opinion that Casey overlapped her men because of "man neediness" (which has little to do with sex and everything to do with needing to be in a relationship for identity and self-esteem). In that regard Casey and Diane Downs are two pears in the same pod. As Susan Smith drowned her kids to be more appealling to a man and is now on an online site for male "pen pals", I'd say she was and is still also "man needy".
Before Tony, Casey could get out of the house and take Caylee with her if Cindy couldn't babysit. Not so, after Tony. Caylee wasn't welcome to "sleep over" in Tony's apartment. I agree with Tony and his roommates that that apartment was no place for a toddler...BUT...to "man-needy" Casey in the throes of desire (and seeing other men didn't mean Casey wasn't overflowing with desire)...not being in her lover's arms because of Caylee was a definite fly in the ointment. From reading the discovery transcripts it doesn't sound like Casey had any REAL babysitting options to watch Caylee at night other than her immediate family.
I've never thought that Casey chloroformed Caylee or tossed her in the Pontiac trunk before June 16. Casey was able to take Caylee WITH her overnight before Tony. It looks like she could con Cindy into watching Caylee sometimes although Casey probably had to return home before dawn broke. After Casey met Tony, according to Casey's cell phone pings, Casey was eventually in the Anthony home after EVERY date (EVERY one of them) with Tony UNTIL the night of JUNE 16. Not ONCE did Casey and Tony have a whole night together. Until after June 16.
Yes, there were signs of plenty of conflict between Cindy and Casey. Every single time Casey was with Tony into the wee hours somebody from the Anthony house SUMMONED Casey home. Casey's cell phone records show calls to Casey at 3 a.m. from the Anthony house while Casey was at Tony's apartment. And immediately after those calls Casey's cell pings follow her home to the Anthony house. Every single night when Casey did stay home with Caylee & Cindy, after Tony entered the picture, Casey's computer and phone records show she was texting, calling or on the computer with Tony...which probably was an irritant to Cindy who might have thought Casey should be assisting more with "mother duties". Even on Cindy's birthday, the records show Casey spending most of that entire night communicating with her new man.
I think Tony was one of the reasons that Caylee was murdered, both because of the added tension his relationship with Casey brought into Casey's relationship with her mother AND because needy Casey was at the highest point of relationship lust--those early week relationship highs can be as addictive as any drug.
imo