Here's my two cents:
Game is like a muscle, it takes a long time to build up and can quickly atrophy if it isn't used. Some may disagree with me on this, but I think it's important to continue running game even whilst in a relationship. Why? Because the best time to prepare for war is during peacetime. Sure things are going well for you and your girl now, but things can change on a dime. If you haven't flirted with another girl in weeks, months, or God forbid years, you'll find yourself having a lot harder time trying to shake off the rust.
I'm not saying you have to cheat (nor am I saying not to), I'm simply saying it's important to keep your skills sharp. This will most likely have a paradoxically positive effect on your relationship. Subconsciously, your girl will pick up on the fact other girls are still interested in you (they seem to be able to sniff this out) and will be less likely to pull shit. After all, it's a well known psychological phenomenon that people are more motivated by a fear of loss than a potential for gain. In other words, if she's worried about losing you to another female, she's less likely to be interested in trying to get another guy. Her feminine territorial instincts will kick in, and that's good for you.
Working out is of the utmost importance. If you're in a relationship, it sends a signal to your significant other you're not interested in letting yourself go, which in of itself accomplishes two things:
1.) Prompts her to maintain her own appearance, so as not to become less appealing to you by gaining ten-to-fifteen pounds once you two are "comfortable" with one another. Girls typically want to feel like the "pretty" one in the relationship, and won't want to be outshined physically by their man.
2.) Subtly (or maybe not so subtly) indicates your interest in maintaining your physical appeal for other women.
If you've recently gone through a break up, working out is a great morale booster. How you feel physically directly ties in to how you feel mentally. Appearance is ideology. Why else do you think all the biggest most miserable feminist cunts are all fat and gross? Joining a gym might even provide opportunities to meet other health-conscious people, girls to game and guys to hang out with. Both good things.
Talk to everyone! I don't care if it's at the grocery store, coffee shop, bookstore or wherever. You don't have to be friends with everyone, mind you. You just have to get back into the habit of exercising your social apparatus.
Longterm relationships have a way of "domesticating" men. I'm not saying all men backslide to beta once in relationships, although that certainly can happen. Even alphas have a tendency to soften their edges around their main girl. You'll need to lose that softness quick once you re-enter the sexual marketplace. Be bold!
As Machiavelli once said:
Quote:"For my part I consider that it is better to be adventurous than cautious, because fortune is a woman, and if you wish to keep her under it is necessary to beat and ill-use her; and it is seen that she allows herself to be mastered by the adventurous rather than by those who go to work more coldly. She is, therefore, always, woman-like, a lover of young men, because they are less cautious, more violent, and with more audacity command her."
Now I'm not advocating actually beating a woman, of course. But don't be timid in your interactions with women, either. As most, if not all, RVF'ers know -- women love strength and being dominated by a confident man. In situations you feel fearful, you must act the opposite. Transmutate the fear into boldness and make your move. I've done this many times and have been pleasantly surprised by what I've been able to achieve in those circumstances. Initially, you'll have to "fake it 'til you make it" but eventually taking bold action and calculated risks will come second nature to you, especially once you start reaping the rewards from such behavior. Nothing in the world breeds success like success, it truly feeds on itself.