Does my boyfriend like anther girl?

okay.... well my boyfriend william use to hag out with this girl name tania he told her every thing.. one day i thought i was pregnant and he told her. and i told him not to tell any body.. #2 he tol me he doesn't take pictures with any body but i was using his Phone and he had pictures of tania ad him together... and i told not to talk to her and hen he said he promise he wouldn't and then the next day e rends came up to me an said that they were sitting on the bleachers talking all period of p.e.. so then i confront him about it he said he didn't take me serious. so then i was taking about her and he called me her name twice i can understand the first time because we were talking about her but then 5 minutes later we were kissing i get up to get a drink of water and he says tania come back.. the he had anther girl name vanessa n his back and he admitted that he kissed her hair..