Why would a woman suddenly become interested?

Sounds like immaturity to me. Wanting to “win” and show up her “friend” to prove to the other woman she can get whomever she wants . Some of this interest can be fake; just part of the act to show her up.

Sounds like a possible set up for a threesome. You may soon achieve a godly respect of all men. Go my son…may the force be with you.

Or it could be the other way around, the first woman may have actually been interested in you, but was shy, or didn’t know if you liked her. She might have been taking her time to try to figure out what to do next. Some shier women don’t just stand up and shout, “Hey dude! I want you right now!”

Her “friend” may be one of the more flirty types (they can be so annoying if you are the shy girl) because sometimes the flirty girl will just jump on in, even if they knew their shyer friend was already interested. Some women just love that kind of attention, from any man, and they don’t realize how hurtful it can be to the shy woman who was already interested. Those extra-flirty women usually end up becoming ex-friends of the shyer women.

Another reason may be that she simply didn’t notice you before or thought you wasn’t interested in dating, or a friend may had said that she wasn’t your type because she thought you would shoot her down or wanted you for herself. Or maybe there were things she didn’t know about you till your girlfriend started bragging about you.

Sometimes people will assume that someone isn’t available because they didn’t make their interest in them clear. So they assume that you may be dating someone else. When I was young, I didn’t know that a boy liked me until I started dating a friend of ours. Since we were all friends, he thought I would simply not date guy friends. I didn’t find out till he started dating someone else. I actually liked him the whole time but thought he saw me as a sister, so I never said anything because I didn’t want things to become awkward if he didn’t feel the same. We were friends for years.

I once had a male friend (ex friend) of my husband tell me that he would treat me like gold if I was his woman. I told him that he doesn’t know me, so why would he say that. He said that for 6 months on deployment, my husband talked about how wonderful of a wife and mother I was. He said he had never been so jealous of another person. He said he fell in love with me.

I told my husband to never brag so much again. It will just bring trouble my way.
Luckily, he took my rejection well and said he would not bother me anymore and wished me well.
So maybe your current girlfriend is bragging a bit too much. (You never know how much you want a cold ice cream on a hot day, till you see someone really enjoying one.)

My wife used to think of me as a big waste of time, until she met a former girlfriend of mine.

She liked that girl and that girl’s liking me, made her think I couldn’t be all that bad, after all.

Maybe you have suddenly become irresistible
!

When you learn someone else is interested in you, your value goes up – lol!

You were the last resort in the playing field perhaps?

Many women tend to be attracted to guys that they know other women want. In fact it has been empirically researched and demonstrated that many women usually do choose the guy that is attached over the guy that isn’t. It does often appear that many women do tend to be their own worst enemies. Your value went up when another woman showed interest in you it appears, unless she’s just playing games (another possibility).