Should I give up or keep trying?

ok well…I cant really talk to and e one else bout this but…I met this guy a couple years ago and we started talking and we got together…we were together for like…6 months…then I started going to the lake with my family..and I never invited him because my dad was strict on guys and I wasnt ready for my dad to meet him..my dad just thinks of me as his little girl. but anyways…he started talking to this other girl…then I guess he thought we broke up and startin dating her…and I was really upset because I was figuring he cheated on me..but that wasnt the case..he had just assumed we broke up…he’s been with this girl for a little over a year now…but we still kinda talk..and “mess around”…I miss him so much and every other guy, when im not with them im just like..whatever..thats his loss..but hes different. I’ve been holding on to him ever since hes been with this girl and I dont know if I should just give up or keep trying…he told me he still likes me but hes just confused..his girlfriend doesnt like me at all because she knows we’ve had sx and still talk. which in understandable…but I still love him with all my heart and as much as I want to stop thinkin about him…I cant! **so should I give up…or keep trying???