infidelity

hey guys

I have been dating a guy for 14mos...i was way more into him then he was me. i felt butterflies and really was feeling in love. he made it clear that he didn't have "those" feelings despite tge way he acted and behavec. we dated 3 to 4 x a week. very active sex life etc...I found out that back in April 2017 he cheated on me...he slept 1x wuth an older woman. he confessed to me in Aug( our 1 yr anniv of dating) . i was devistated...he confessed his love to me. I tjought we could work through it. we have even talked about marriage and hebought me an engagemwnt ring.

my problem is i thought the ring would make me be ok with stuff but to be honest i have lost alot of my feelings for him. idk what to do. should i ask for space or just end things? or continue

on our track and hope ill get over it...I just feel as if i cant believe him....am i being rediculous??? I'm so torn...i cant believe that i once had such strong feelings and now i don't obsess over him the way i used to...is there anyone here who has gone tgrough something similar?

tia