<human>: Can you provide a brief rundown of the text in within 3 sentences?

At first I accepted this - he explained it as they used to have a drunken kiss every now and then before we got together and I thought there was no point senselessly hurting the girl's feelings. I'm not threatened by the girl romantically particularly (although occasionally I feel excluded). They've been friends for 4ish years. We've been together for almost 1.5 years so I am starting to wonder whether he should probably be putting her feelings aside and introducing me? Being honest I don't like the idea of her feeling possessive over him and him pandering to that. Having said that, it doesn't practically affect much since they normally see each other one on one (maybe every 2 months) and group events are rare (~2x a year) so it doesn't practically exclude me that often. What do you guys think? I want to be reasonable here.
<bot>: After 1.5y I feel I should meet this girl but I'm not sure if it's just a silly point of principle.