how to tell if a guy is into me??

okay this is fr so embarrassing but i do not understand boys AT ALL anymore and idk how to tell 😭

i was in a 4 year relationship where i asked him out so it’s been a really long time since i’ve been interested in anyone or anyone showed an interest in me other than my ex as everyone i know knew abt my relationship.

i got w my ex at 14 and we broke up semi-recently so it’s been a LONG time. anyways i don’t know what the signs are and such and i was wondering if anyone could help out at all ☹️

tldr: i was in a long term relationship and forgot how to understand guys 😭 so now i don’t know how to tell if a guy is being my friend or if he’s flirting 😕