He doesn't want anymore..What's going on?

Ok, here's the deal..we've been seeing each other for a 1 1/2 years. In the beginning, we were having all the time. Now, it's like he's not interested anymore. He did have 2 jobs for a few weeks where he did his reg 9-5 job then went to work on tiling a house hard manual labor..so his reasoning was he was too tired..well now he's not doing that anymore and he still doesnt act like he wants..He says my jealousies, accusations, and insecurities are making me not as attractive to him..Well, i mean he did kiss another girl about 6 months ago who was 17 and was a daughter of a great friend of his.he hung out with this family all the time.. I found out about this back in December and went ballistic i called the girl, i called the parents.they were like he told us you guys broke up (which we did, but we were still sleeping together trying to make it work) anyways, they said he is no longer a part of our lives..blah blah..well guess what he started hanging out with this family again..we are both 27 btw..he swears he doesnt like the girl and he just likes hanging with the dad and bro..well he went over there last saturday to spend the night and take the family on his boat since they live 45 min away..I went ballistic and started texting the mom saying well all have to hang out sometime so she knows im still in the picture..she never texted back..then i sent the girl a friends request on myspace..she denied and then i kept calling him on his phone while he was over there and the brother got on the phone saying there was nothing going on and i needed to quit acting psycho..that neither the girl or he had anything going on..this is what the brother said..then my guy said that i was embarring him and harring this family..it made him so turned off by me..but i mean look what happened before?? so that and other things we arent really doing it..It had been 3 1/2 weeks since we had done it and i basically threw myself on him..pathetic i know i just needed his affection so bad..then after he was like now are you happy?? like he did it for me..we did it again a few days later but he pulled out before he went..he never does that..im on the pill and he said he wasnt sure i was taking my pills..bull crap..i always take my pills..i feel he was trying to detach whats going on? Im reading too much into everything? am i driving him crazy and away from me through my clingyness and to him acting pyschotic??