Plz help i m dyin...i m deeply in love...?

i love diz guy who waz my frnd 4 almost a yr n evn he loves me alot n v r into a relationship. i love him so much dat i cant think anythng beyond him. i can evn die 4 him n leave d entire world 4 him. i knw him really well i mean his nature n all but at times i get little suspicious abt things he does n says. n some times i evn think dat he is cheating on me n whn i talk 2 him abt diz things he feels bad dat i dnt trust him. n thn derz no option 4 me except 4 trusting him.is der a way dat i can knw if hez lyin or no??? how do ppl trust thier partners so easily??? i m scared 2 loose him.i m really serious abt him n wanna marry him soon. so before i tell my parents abt him i wanna b confident abt him...is he at fault or itz all in my mind n derz nothng 2 worry abt???kindly help me out. thanx