DEAR ABBY: I’m a 35-year-old gay man who has been in a serious relationship for five years. During the last year, my significant other, “Grady,” has grown very close with a female co-worker of mine he met at my office party. (I’ll call her Tina.) They have become inseparable, and when they aren’t hanging out, he’s constantly texting and calling her. At first I didn’t have a problem with it, but lately I’m getting some strange vibes. Grady always said he was never attracted to women, but I have caught him ogling Tina when she’s at our pool in her ...